MDCAT Mock Test 2027: Free 20-Question Timed Practice With Explanations

A real MDCAT mock test across Biology, Chemistry, Physics and English — timed, with a full explanation for every answer. Try the first 20 questions free.

MDCAT is 180 MCQs in 180 minutes across Biology, Chemistry, Physics and English, weighted heavily toward Biology. Most "MDCAT mock test" pages online are a single subject's past paper with an answer key — useful for review, but they don't train the actual skill the real test demands: sustaining accuracy across four different subjects, back to back, under a hard clock.

Preparing for MDCAT? Practise explanation-backed MCQs in the MDCAT QBank. Your first 20 questions are free.

A mock test worth the name needs the same three things every time: questions from all four sections in something close to the real ratio, a running timer, and an explanation for every answer, not just the correct one. That's the format below, and it's also exactly what HighYield's free MDCAT sample gives you — no sign-up, no payment, the first 20 questions of the real bank, timed and explained.

Sample Practice Set — Across All Four Sections

Biology

1. Which blood vessels carry blood away from the heart?

A) Veins
B) Arteries ✅
C) Capillaries
D) Venules

2. The functional unit of the kidney is called the:

A) Alveolus
B) Neuron
C) Nephron ✅
D) Villus

Chemistry

3. Which of the following is an example of an alkali metal?

A) Calcium
B) Sodium ✅
C) Aluminium
D) Magnesium

4. The process by which a solid changes directly into a gas is called:

A) Evaporation
B) Condensation
C) Sublimation ✅
D) Fusion

Physics

5. The SI unit of electrical resistance is the:

A) Ampere
B) Ohm ✅
C) Volt
D) Watt

6. According to Ohm's Law, current is directly proportional to:

A) Resistance
B) Voltage ✅
C) Power
D) Time

English

7. Identify the correctly spelled word:

A) Recieve
B) Receive ✅
C) Receeve
D) Receve

Seven questions across four subjects — keep that pace up for the full 180 and you're within reach of what the real MDCAT demands.

Take the Real Thing, Free

HighYield's MDCAT question bank has thousands of questions across Biology, Chemistry, Physics and English, each with a full explanation, and the first 20 questions are free to try right now — same format, same timer, no account needed to start.

Liked the format and ready to go further? Our guide on when to start taking full mock tests and how to run one properly covers timing, pacing, and how to read your score once you move up to a complete 180-question attempt.

Timed like the real MDCAT: practice under actual pacing pressure, not an untimed PDF.
Every answer explained: understand why the wrong options are wrong, not just which letter was correct.
All four sections, properly weighted: not a single-subject quiz mislabelled as a full mock test.

For a subject-by-subject look at the concepts that repeat most often, see our Most Repeated MDCAT MCQs by Subject. Start the free MDCAT sample from the MDCAT question bank page — no sign-in required for your first 20 questions.

Ready for the Full 180-Question Simulation?

Once you have unlocked the full MDCAT bank, HighYield also includes two complete, timed MDCAT mock exams at no extra cost — the full official format, 180 questions in 180 minutes, no pausing, one attempt at a time, exactly like exam day. They are the closest rehearsal you can get before the real test.