PrepCat: 2027 MCAT prep, question bank and study plan

Most MCAT prep is a dozen disconnected tools and a plan you fall behind on.

PrepCat is one complete prep instead. Your plan, your practice, your mistakes, your content, and your readiness, all in one place and all pointing at the same thing, your test day. So you always know you are on track.

The plan

This is what your week actually looks like

Not a static PDF. A living calendar paced to your test date and the hours you really have. Review is sized to the questions it follows, flashcards to your real card load, and a missed week reshapes the plan instead of breaking it.

Weighted to your weak sections
About 45 minutes of review for every hour of questions
Fits the hours you have and the weeks you are away

Bio/Biochem
Chem/Phys
CARS
Psych/Soc
Mixed

This week

Practice phaseSample

Nov 2 to Nov 8 · 36h planned

Mon

2

4h 45m

Flashcards

8:30to 9:20 AM

35 new from Muscle and Bone plus about 280 due reviews

Bio/Biochem content

9:30to 10:50 AM

Muscle and Bone

40 PrepCat questions Bio/Biochem

11 AMto 12:10 PM

Muscle and Bone

Review your mistakes

12:20to 1:10 PM

CARS 2 passages

2:30to 3:05 PM

Tue

3

4h 40m

Flashcards

9to 9:50 AM

35 new from Acids, Bases, and Buffers plus about 280 due reviews

Chem/Phys content

10to 11:20 AM

Acids, Bases, and Buffers

30 PrepCat questions Chem/Phys

11:30 AMto 12:20 PM

Acids, Bases, and Buffers

Review your mistakes

12:30to 1:05 PM

CARS 4 passages

3to 4:05 PM

Wed

4

5h 15m

Bio/Biochem content

9to 10:35 AM

Enzymes and Kinetics

35 PrepCat questions Bio/Biochem

10:45to 11:45 AM

Enzymes and Kinetics

Review your mistakes

11:55 AMto 12:40 PM

Flashcards

3:40to 4:30 PM

35 new from Enzymes and Kinetics plus about 280 due reviews

CARS 4 passages

4:40to 5:45 PM

Thu

5

5h 15m

Flashcards

9to 9:50 AM

35 new from Fluids at Rest and in Motion plus about 280 due reviews

Chem/Phys content

10to 11:15 AM

Fluids at Rest and in Motion

45 PrepCat questions Chem/Phys

11:25 AMto 12:45 PM

Fluids at Rest and in Motion

Review your mistakes

12:55to 1:55 PM

CARS 3 passages

3to 3:50 PM

Fri

6

5h 20m

Flashcards

9to 9:50 AM

35 new from Learning and Memory plus about 280 due reviews

Psych/Soc content

10to 11:10 AM

Learning and Memory

35 PrepCat questions Psych/Soc

11:20 AMto 12:20 PM

Learning and Memory

Review your mistakes

12:30to 1:15 PM

CARS 6 passages

2to 3:35 PM

Sat

7

7h 30m

Full length

AAMC Full Length 4

8 AMto 3:30 PM

Chem/Phys
8to 9:35 AM
CARS
9:45to 11:15 AM
Bio/Biochem
11:45 AMto 1:20 PM
Psych/Soc
1:30to 3:05 PM

Sun

8

3h 15m

Review your full length

10to 11:50 AM

Go through every miss. Was it a content gap or a careless error?

CARS 2 passages

12to 12:35 PM

Flashcards

12:45to 1:35 PM

35 new cards plus about 280 due reviews

Mon2Tue3Wed4Thu5Fri6Sat7Sun8

Wednesday, Nov 4

5h 15m

Bio/Biochem content

9to 10:35 AM

Enzymes and Kinetics

35 PrepCat questions Bio/Biochem

10:45to 11:45 AM

Enzymes and Kinetics

Review your mistakes

11:55 AMto 12:40 PM

Flashcards

3:40to 4:30 PM

35 new from Enzymes and Kinetics plus about 280 due reviews

CARS 4 passages

4:40to 5:45 PM

Your week

Every session, in its place.

Keep scrolling to see the same week by the hour.

By the hour

Planned by the hour.

Every session has a start, an end and exactly what to cover, and Saturday’s full length is laid out section by section, breaks included.

Today

One topic, four sessions.

Wednesday reads Enzymes and Kinetics, drills it, goes back over every miss, then cards it. The next four chapters are those four sessions.

today: a chapter, its questions, its cards, its misses

The library

Six textbooks, written for this exam

Not a PDF of someone else’s notes. 72 chapters with 1,705 figures drawn for the page they sit on, about 32 hours of reading in all. Open a book and you see every chapter and how far you are in each.

Physics, chemistry, orgo, biology, biochem, psych
Stuck on a page? Ask the tutor about it
Your plan names the chapter to read each day

Pick a cover to open it.

MCAT · Bio / Biochem

Biochemistry

5 / 12

chapters mastered

Contents

Sample12 chapters

1MasteredAmino Acids and ProteinsAmino acid structures and properties, the peptide bond, and the four levels of protein folding28 min100%

2 ResumeEnzymes and KineticsCatalysis by transition state stabilization, Michaelis Menten kinetics, and every kind of inhibition28 min60%

3Protein Function and AnalysisStructural, motor, binding and signaling proteins, plus how proteins are separated and measured22 minnot started

4MasteredCarbohydratesMonosaccharide structure and stereochemistry, ring forms, glycosidic bonds, and the polysaccharides22 min100%

5MasteredLipidsFatty acids, triacylglycerols, phospholipids, steroids, and the lipids that carry messages20 min100%

6MasteredDNA, Replication, and BiotechnologyDNA structure, replication, repair, and the biotechnology built on top of it from PCR to sequencing26 min100%

7From Gene to ProteinTranscription, RNA processing, the genetic code, translation, and how expression gets controlled26 minnot started

8Membranes and TransportMembrane composition and fluidity, the transport proteins, and how membrane potentials arise22 minnot started

9RevisitGlucose MetabolismGlycolysis step by step, its regulation, fermentation, glycogen handling, and gluconeogenesis30 minnot started

10MasteredAerobic Respiration and ATPPyruvate oxidation, the citric acid cycle, the electron transport chain, and chemiosmosis26 min100%

11Fat and Protein MetabolismBeta oxidation, ketone bodies, lipid synthesis, amino acid catabolism, and the urea cycle26 minnot started

12Metabolic RegulationEnergy currency, the regulated steps, and how fed, fasting and starving states rewire metabolism24 minnot started

5 mastered1 in progress1 to revisit5 ahead

the plan has you in this book at 9 AM today

Pick a cover to open it.

The 2027 question bank

4,207 questions, written like the real exam

682 passages and 822 standalone questions across all four sections. Every question has a worked solution: why the right answer is right and why each of the three traps fails. Still unsure? Ask the tutor under it, or turn the miss into a flashcard in one tap.

Bio/Biochem1,107

Chem/Phys1,051

CARS1,041

Psych/Soc1,008

Total4,207

Answer choices explained: 16,828
Solutions with a figure or picture: 2,363
Figures, tables and charts in passages: 600

Sample

ExitPrepCat Practice (Bio/Biochem)00:422 of 5

HighlightStrikethroughFlag for ReviewFlag

Tutor mode on

Passage 1 (Questions 1 to 5)

Researchers isolated a mutant form of lactate dehydrogenase from skeletal muscle and compared its kinetics with the wild type enzyme at 37 °C. Initial velocities were measured across a range of pyruvate concentrations while NADH was held at saturating levels (Figure 1).

Figure 1 Initial velocity as a function of pyruvate concentration

A second series repeated the assay in the presence of oxamate, a structural analog of pyruvate, and the apparent kinetic constants were

Question 2

Based on Figure 1, the mutation most likely changed:

A.The affinity of the enzyme for NADH

B.The turnover number, kcat

C.The Michaelis constant for pyruvate

D.The equilibrium constant of the reaction

Periodic TablePreviousNavigationNext

Flashcards

Flash Card Engine 2.0, with PrepCat’s deck built in

Matched to PrepCat’s six textbooks, chapter by chapter: 72 decks, 4,436 cards, and 3,363 of them carry a figure. Rate a card and the scheduler sets the day it comes back, right before it would slip.

Scheduled with FSRS, so reviews land right before you forget
Today’s new cards follow today’s reading
Bring your own Anki deck (.apkg) or a CSV

Build my plan

ExitToday · Enzymes and Kinetics350280Sample

Mistakes › Biochem

Two forms of an enzyme reach the same Vmax, but one needs more substrate to reach half of it. Which constant differs, and what does that say about binding?

Undo Bury SuspendFrom your Mistakes deck

Work & Energy

Efficiency is the ratio of useful work output to work input, usually quoted as a percentage.Social Structure and StratificationLanguage is spoken or written symbols combined by rules into a system.Light & Optics

Concave mirror with the object OUTSIDE the focal point: the image is real and inverted.Cognition, Consciousness and Language

Sleep spindles and K complexes appear on the EEG in sleep stage 2 and in no other stage.The Endocrine SystemEndorphins released from the anterior pituitary decrease the perception of pain.Acids & Bases

A conjugate pair differs by exactly one proton; the stronger the acid, the weaker its conjugate base.Amino Acids, Peptides & Proteins

In an α-helix, each backbone C=O hydrogen bonds to the N–H four residues down the chain.Biological Membranes

Endocytosis takes material into the cell by invaginating the membrane and pinching off a vesicle.Atomic & Nuclear Phenomena

The reaction shown is alpha decay: the nucleus ejects a helium-4 nucleus, so A falls by 4 and Z falls by 2.Work & Energy

Efficiency is the ratio of useful work output to work input, usually quoted as a percentage.Social Structure and StratificationLanguage is spoken or written symbols combined by rules into a system.Light & Optics

Concave mirror with the object OUTSIDE the focal point: the image is real and inverted.Cognition, Consciousness and Language

Sleep spindles and K complexes appear on the EEG in sleep stage 2 and in no other stage.The Endocrine SystemEndorphins released from the anterior pituitary decrease the perception of pain.Acids & Bases

A conjugate pair differs by exactly one proton; the stronger the acid, the weaker its conjugate base.Amino Acids, Peptides & Proteins

In an α-helix, each backbone C=O hydrogen bonds to the N–H four residues down the chain.Biological Membranes

Endocytosis takes material into the cell by invaginating the membrane and pinching off a vesicle.Atomic & Nuclear Phenomena

The reaction shown is alpha decay: the nucleus ejects a helium-4 nucleus, so A falls by 4 and Z falls by 2.

Social Structure and Stratification

Socioeconomic status bundles three things: income, education and occupational prestige.The Musculoskeletal System

The A band spans the entire length of the thick filament, so it holds both filaments wherever they overlap.EnzymesA cofactor or coenzyme bound tightly/covalently is called a prosthetic group.Carbohydrate Metabolism II

One turn of the cycle yields 3 NADH, 1 FADH₂, 1 GTP, and 2 CO₂.Sensation and Perception

The eustachian tube links the middle ear to the nasopharynx and equalises pressure across the eardrum.Amino Acids, Peptides & ProteinsProteins that help other proteins fold are called chaperones.DNA & Biotechnology

Histone acetylation neutralizes that positive charge, loosens chromatin and activates transcription.Lipid & Amino Acid Metabolism

As lipoprotein lipase strips triacylglycerol out of it, VLDL shrinks into IDL and then into LDL.Motivation, Emotion and Stress

The three stages of the general adaptation syndrome, in order: alarm, resistance, exhaustion.Social Structure and Stratification

Socioeconomic status bundles three things: income, education and occupational prestige.The Musculoskeletal System

The A band spans the entire length of the thick filament, so it holds both filaments wherever they overlap.EnzymesA cofactor or coenzyme bound tightly/covalently is called a prosthetic group.Carbohydrate Metabolism II

One turn of the cycle yields 3 NADH, 1 FADH₂, 1 GTP, and 2 CO₂.Sensation and Perception

The eustachian tube links the middle ear to the nasopharynx and equalises pressure across the eardrum.Amino Acids, Peptides & ProteinsProteins that help other proteins fold are called chaperones.DNA & Biotechnology

Histone acetylation neutralizes that positive charge, loosens chromatin and activates transcription.Lipid & Amino Acid Metabolism

As lipoprotein lipase strips triacylglycerol out of it, VLDL shrinks into IDL and then into LDL.Motivation, Emotion and Stress

The three stages of the general adaptation syndrome, in order: alarm, resistance, exhaustion.

made from the miss in chapter 03

Your mistakes, connected

Every mistake becomes a map

Two topics link when they are related, so a gap in one shows you the others it drags down. Pick a topic to see what it connects to, and why.

Your mistake map

Every topic you have missed, grouped by section. Bigger circles mean more misses, and lines link related topics where a gap can spread.

Sample

Your mistake map

Sample

Drawing your map

today's topic

Filed for you

Every miss in the bank lands on your map the moment you finish a set. Missed one somewhere else? Snap a photo and it is read and filed the same way.

Five kinds of miss

Content gapTrap answerMisreadCarelessTiming

The score

Every part of the plan points at the same number

Your target sets the pace. The bank, the books, the cards, and the readiness score all work back from it, so the plan you follow in week one is the one that gets you there on test day.

515+

The score PrepCat is built for

4,207 questions, every answer choice explained
39 in depth guides
4,436 flashcards

Overall readiness · from your scores

Sample

Anchored to your latest full length, then moved only by proof: your accuracy in the bank, the mature cards you keep, and the mistakes you master.

Your exam

January 15, 2027

73 days to go

Bio94%

Latest full lengthQuestions 86%

Chem87%

Latest full lengthQuestions 79%

CARS77%

Latest full lengthQuestions 68%

Psych93%

Latest full lengthQuestions 88%

Day oneTest day

1

Tell us your target and test date

Your goal score, your official 2027 test date, the resources you already use and the hours you have. About three minutes, no card.

2

Get a plan built around you

A full schedule to test day, weighted to your weak sections and paced to the hours you actually have.

3

Every miss, filed

Bank misses file themselves. Snap a photo of any other miss and it is read, filed and turned into review.

4

Watch your readiness climb

An honest score projection that moves with what you really do, so you always know where you stand.

FoundationPracticePolish

The plan’s three phases, as it names them.

Day one

1

Tell us your target and test date

Your goal score, your official 2027 test date, the resources you already use and the hours you have. About three minutes, no card.

2

Get a plan built around you

A full schedule to test day, weighted to your weak sections and paced to the hours you actually have.

3

Every miss, filed

Bank misses file themselves. Snap a photo of any other miss and it is read, filed and turned into review.

4

Watch your readiness climb

An honest score projection that moves with what you really do, so you always know where you stand.

Test day

FoundationPracticePolish

The plan’s three phases, as it names them.

Also in PrepCat

Everything else your prep needs

Study rooms with friends, an advisor that edits the plan, hack sheets, 39 guides, practice passages on your weak spots, full length tracking, and an arcade for the boring parts. All in the same account.

Study rooms

Work a set with friends, live

Start a room from any set and up to three friends join with a six character code. You see each other’s highlights and picks as they happen, and the answer can wait until everyone has chosen. A friend without a subscription gets one free session.

Sample

Study roomK7M2QXCopy invite linkESJE hosts

Based on Figure 1, the mutation most likely changed:

A.The affinity of the enzyme for NADH

B.The turnover number, kcat

C.The Michaelis constant for pyruvate

D.The equilibrium constant of the reaction

Answer locked in, waiting for J

Incorrect · correct answer is C

The advisor

Ask it to change your week

Tell it about a wedding, a lighter week, or a section you want to push. It lays out the change, you tap Apply, and it keeps you honest about staying on pace.

Sample

Your advisor

Behind, ahead, stressed, or stuck? Say what changed and it reshapes your plan from today.

Wedding this weekend, can you clear it and add more CARS?

Congrats! I can clear both days, and since CARS is where you miss most, add a CARS block to every study day.

Here is what I will do:

•Clear Saturday and Sunday
•Add a CARS block to every study day

Apply these changesNot now

Hack sheets

Notebook pages for the formulas and the memory hooks

One sheet per topic, with the equations boxed, the traps flagged, and highlighter on what to memorize. Rendered here exactly as the app draws it.

Chem / Phys

Motion, forces, and energy

Every mechanics and energy formula on the exam, plus how to use them.

Kinematics

v_avg = Δx/Δt a = Δv/Δt

v = v₀ + at

Δx = v₀t + ½at²

v² = v₀² + 2aΔx

← no time needed

v₀ₓ = v₀cosθ v₀ᵧ = v₀sinθ

← projectile components

→Projectile motion: x and y are independent. At the very top, v_y = 0.

→Free fall: take g ≈ 10 m/s². Dropped from rest, an object falls 5 m in the first second.

Forces and rotation

F_net = ma

F_f,max = μ_s F_N F_f = μ_k F_N

← static max, then kinetic

N = mg cosθ pull = mg sinθ

← on an incline

τ = rF sinθ

← torque · r is the lever arm

F_c = mv²/r a_c = v²/r

← centripetal

x_cm = Σmx / Σm

← center of mass

!Normal force is not always mg. On an incline or in an elevator, draw the free body diagram.

Work, energy, and power

KE = ½mv²

U = mgh U_spring = ½kx²

F = −kx

← Hooke law

W = Fd cosθ = ΔKE

← work energy theorem

W = PΔV

← work on a pressure volume curve

P = W/t = ΔE/t = Fv

← power, in watts

MA = F_out / F_in

← mechanical advantage

→No friction means energy is conserved: KE_i + PE_i = KE_f + PE_f.

Deep guides and lessons

39 guides written for the MCAT, with the parts tied to your own mistakes flagged first.

GlycolysisAcid baseMemory modelsCARS reasoning

Practice passages on your weak spots

A fresh passage and questions built around a topic you keep missing, with a hint that nudges instead of telling.

An arcade for the boring parts

Drill high yield facts in fast games that make memorization feel good.

Full length tracking

Log your practice exams and see your real trajectory next to your projected score, section by section.

Log a full length

Sample

WHICH EXAMAAMC FL1

DATE TAKENmm / dd / yyyy

Bio / Biochem

Chem / Phys

CARS

Psych / Soc

TOTAL SCORE472 to 528

Save and recalibrate

Why PrepCat

A complete prep, not another tool to juggle

It plans, it drills your weak spots, it maps your mistakes, and it keeps you honest about your score. One system does what a shelf of separate tools cannot.

What you getPrepCatA pile of tools

One adaptive plan to test day

Rebuilds when you fall behind

Mistakes connected into a map

Spaced repetitionon your own

Deep content and questionson your own

An honest readiness score

Questions

Good things to know

Building your plan is free and needs no card, so you see your first week before you pay. Everything after that is one subscription: $29.99 a month, or $69.99 for 3 months (about $23.33 a month). It covers the full calendar, the 2027 question bank, the six books and the guides, the flashcards, the mistake map, the advisor and the arcade. There is no free trial. Cancel anytime in Settings and keep access until the end of the period you paid for.

4,207 questions across all four sections, set in 682 passages plus 822 standalone questions. Every question has a worked solution that explains all four choices, the right one and the three traps, and ends with the educational objective. 2,363 solutions come with a figure or a picture. Under every solution you can ask the tutor about the question, or tap Create a flashcard of this concept error to file the idea in your Mistakes deck.

Build your 2027 MCAT plan in about three minutes

Your test date is not moving. Start today, put every remaining day to work, and see your first week laid out before you spend a cent.

Build my plan free

No card to build your plan. Then $29.99 a month or $69.99 for 3 months, cancel anytime in Settings.

Everything you need to master the MCAT, built around you.

Most MCAT prep is a dozen disconnected tools and a plan you fall behind on.

This is what your week actually looks like

Six textbooks, written for this exam

Physics

Chemistry

Organic Chemistry

Biology

Biochemistry

Psychology

Biochemistry

4,207 questions, written like the real exam

Flash Card Engine 2.0, with PrepCat’s deck built in

Every mistake becomes a map

Every part of the plan points at the same number

Tell us your target and test date

Get a plan built around you

Every miss, filed

Watch your readiness climb

Tell us your target and test date

Get a plan built around you

Every miss, filed

Watch your readiness climb

Everything else your prep needs

Work a set with friends, live

Ask it to change your week

Notebook pages for the formulas and the memory hooks

Motion, forces, and energy

Kinematics

Forces and rotation

Work, energy, and power

Deep guides and lessons

Practice passages on your weak spots

An arcade for the boring parts

Full length tracking

A complete prep, not another tool to juggle

Good things to know

Build your 2027 MCAT plan in about three minutes