MCAT Marking Scheme
(Foundation & Exam Strategy – MCAT)
1. Simple Explanation
| What | How it works | Why it matters |
|---|---|---|
| Raw score | Count of correct answers in each section (1 point per correct answer). | Shows how many questions you answered correctly. |
| Scaled score | Raw score is converted to a scaled value (118‑132) using a statistical model that accounts for item difficulty and test‑taker ability. | Allows scores from different test administrations to be compared fairly. |
| Total score | Sum of the four section scaled scores (472‑528). | The overall MCAT score used by medical schools. |
Key point: No penalty for guessing – every question is worth a full point if you get it right, and zero if you get it wrong.
2. Key Points
| Item | Detail |
|---|---|
| Sections | 4 sections, each 32 scored items: 1) Biological & Biochemical Foundations of Living Systems (B&BF), 2) Chemical & Physical Foundations of Biological Systems (C&PBF), 3) Psychological, Social, & Biological Foundations of Behavior (PS&BF), 4) Critical Analysis & Reasoning Skills (CARS). |
| Raw score | 0–32 points per section. |
| Scaled score | 118–132 per section. |
| Total score | 472–528. |
| Scoring algorithm | Rasch Model (a form of Item Response Theory). It normalizes raw scores across different test versions, adjusting for varying difficulty. |
| No penalty | Wrong answers do not subtract from your score. |
| Item weighting | In the raw count every question is equal; the scaling process effectively weights items by difficulty. |
| Practice items | The MCAT includes unscored practice items in each section; they are indistinguishable from scored items during the exam. |
| Score release | 1–2 weeks after taking the test, usually via the AAMC website. |
3. Worked Example
Step‑by‑step conversion
| Section | Raw Correct Answers | Raw Score | Scaled Score (approx.) | Explanation |
|---|---|---|---|---|
| B&BF | 24 | 24 | 125 | 24 correct → 125 scaled (typical mapping). |
| C&PBF | 22 | 22 | 120 | Slightly lower raw → lower scaled. |
| PS&BF | 26 | 26 | 130 | Higher raw → higher scaled. |
| CARS | 19 | 19 | 115 | Lower raw → lower scaled. |
| Total | — | 91 | 490 | 125 + 120 + 130 + 115 = 490 |
Interpretation:
- Raw total = 91/128 (≈ 71 %).
- Scaled total = 490, which is above the median (≈ 500).
- The conversion is not linear; each section’s raw score maps to a scaled score based on the difficulty of the items you answered correctly.
4. Quick Revision Summary
- 4 sections × 32 scored items → raw score = # correct.
- Raw → Scaled (118‑132) via the Rasch Model; no guessing penalty.
- Total score = sum of 4 scaled scores → 472‑528.
- Practice items are unscored but indistinguishable.
- Score release: 1–2 weeks after test date.
Tip: Focus on accuracy over speed. Since wrong answers give no penalty, it’s safer to skip a question you’re unsure of than to guess wildly.