IMAT Scoring Explained: Should You Guess?
Almost every IMAT guide tells you the scoring: +1.5 for a correct answer, −0.4 for a wrong one, 0 for a blank. Maximum 90 points across 60 questions.
Then they tell you "so be careful about guessing" and move on.
That's not advice. That's a shrug. The question has an actual answer, it's arithmetic, and it takes about two minutes to work out so let's do it properly, because the result is more interesting than either "always guess" or "never guess."
How is the IMAT scored?
Each correct answer is worth +1.5 points. Each wrong answer costs −0.4 points. Unanswered questions score 0. There are 60 questions and the maximum possible score is 90.
The section breakdown, from the 2025 paper:
- Reading skills and knowledge acquired during studies — Q1–4 (4 questions)
- Logical reasoning and problem-solving — Q5–9 (5 questions)
- Biology — Q10–32 (23 questions)
- Chemistry — Q33–47 (15 questions)
- Physics and Mathematics — Q48–60 (13 questions)
You have 100 minutes. That's 100 seconds per question, and that number matters for what follows.
Should you guess on the IMAT? The actual arithmetic
Every question has five options. If you have genuinely no idea and guess at random, you have a 1-in-5 chance of being right and a 4-in-5 chance of being wrong.
So the expected value of a blind guess is:
(0.2 × +1.5) + (0.8 × −0.4) = 0.3 − 0.32 = −0.02 points
Very slightly negative. Essentially zero, but on the wrong side of it.
That's the whole answer to "should I guess blind?" — no, but only just. The penalty is calibrated almost exactly to make random guessing pointless. That's not an accident; it's the design.
Now eliminate one option
Here's where it gets interesting.
Suppose you can rule out just one of the five options. Not solve the question — just confidently discard one wrong answer. Now you're guessing between four:
(0.25 × +1.5) + (0.75 × −0.4) = 0.375 − 0.3 = +0.075 points
Positive. The moment you can eliminate a single option, guessing becomes worth doing.
So the rule is not "don't guess." The rule is: never guess blind, always guess once you've eliminated one. Personally, I would say you can guess ONLY if you you’re stuck between two answers e.g. you know for sure that the answer to the question is either A) or C).
That is a genuinely different instruction from what most guides give you and it's worth marks.
Why this changes how you should work the paper
Elimination isn't a consolation prize for questions you can't do. It's a scoring strategy with a positive expected value, and it's often faster than solving. Take a real example, IMAT 2025, Question 8, a logic question about three coloured pills in three coloured boxes, where no pill is in its own colour box and the blue pill isn't in the green box.
You could solve it. It takes about ten seconds: the blue pill can't be in blue (rule) or green (stated), so it's in red. Green can't be in green and red is taken, so green's in blue. Red takes what's left.
Or you could not solve it at all. Look at the five options:
- Option A puts every pill in its own box — breaks the rule in the first line. Dead.
- Option C leaves the green pill in the green box. Dead.
- Option D puts two pills in the blue box. Not physically possible. Dead.
- Option E puts the blue pill in the green box, which was explicitly forbidden. Dead.
- Option B is what's left. It's the answer.
Four options eliminated from reading the options themselves, without doing any reasoning at all. That's the mindset shift: the options aren't just answers. They're evidence. On a 100-minute paper, sometimes the fastest route through a question is to never solve it.
The thing the scoring is really telling you
The −0.4 penalty exists to stop you converting ignorance into points. It's set almost exactly at the level where random guessing is worthless.
But it does nothing to stop you converting partial knowledge into points. Eliminate three options and the maths tips in your favour immediately. Which means the IMAT rewards a specific skill that isn't "knowing the answer": the ability to look at five options and confidently kill one. That's a trainable skill, and almost nobody trains it.
Where to go next
Practise elimination on real papers: IMAT Past Papers
Or find out where your marks are actually going with our Free Diagnostic Test
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Alex — medicine student at Sapienza University, Rome. Scored top 20 in Europe on the IMAT.
