A practice paper arrives — downloaded from a question bank, forwarded on a messaging app, bundled with a course you are considering — and the only question most candidates ask is when they will have a free afternoon to sit it. That is the wrong first question. A practice paper is a measuring instrument, and an instrument nobody has checked can be worse than none at all: it will still produce a number, you will still believe the number, and if the paper does not resemble the exam it will quietly train you for a different one. Ten minutes of inspection before you start is the highest-return work available in mock preparation, and it is routinely skipped.
Check the shape against the official description
There is exactly one authoritative account of what this exam looks like, and it is not the paper in front of you. The official dMAT material describes the modules, the task types inside them and how the testing time is structured. Our syllabus overview summarises that, and for anything time-sensitive the official sources are the reference rather than any summary, including ours.
With that in hand, the first check is structural. Does the paper present the two modules the official description names, or has it flattened them into one undifferentiated question set? Do its task types appear in the published account of the exam, or has it introduced formats you cannot find described anywhere official? A paper that invents a question type is not testing the dMAT, it is guessing at it, and somebody's guess is worth less to you than the official model tasks it is competing with. Our guide to using the official preparation materials covers how to get the most out of that limited supply, and it is the yardstick everything else gets measured against.
Read three explanations before you solve anything
Skip to the answer key and read the explanations for three questions picked at random. This takes five minutes and tells you more about where a paper came from than the questions themselves do.
You are looking for reasoning. A good explanation names the method, the step that turns the question into something solvable, and better still says where a plausible wrong option comes from. A bad explanation restates the answer: the correct option is C, because the sequence follows the pattern in C. That circularity usually means the paper was assembled around an answer key rather than written from a method, and a paper like that cannot teach you anything on review, which is where most of a mock's value actually sits. Our note on reviewing a mock properly assumes explanations you can argue with; material that offers none reduces a full sitting to a bare score.
While you are in the key, solve two or three items yourself and check your answers against it. Keys in circulated material are wrong more often than you would expect, and finding that out after a timed sitting, when a correct answer has been marked against you, is both demoralising and misleading.
Ask what the paper actually rewards
The most common failure in unofficial material is not poor quality but wrong target. Papers get repurposed from other entrance exams, and the substitution is easy to miss because the questions still look demanding.
On the official account, the Core module tests procedural reasoning: you are given a structure and asked to work it out. So a question that needs a remembered formula, a definition, or content from a taught syllabus is testing recall, which is a different faculty and a different exam. Our note on Core module strategy sets out what those task types actually ask, and anything in your paper that cannot be answered by method alone deserves suspicion.
The General Academic module has the mirror-image test. Every question about a passage should be answerable from the passage. If answering needs something you happen to know about the field — and it is easy not to notice when you do happen to know it — the question has smuggled in outside knowledge. Rewarding that habit is actively harmful, as reading passages outside your field explains.
Uniform difficulty is a warning
Look at the spread. A paper on which everything is straightforward will hand you a flattering score and no information. One on which everything is punishing does the reverse, and usually says more about the author's idea of rigour than about the exam. Neither is representative, because a test that sorts candidates needs items across the range, which means easy ones and hard ones in the same paper.
This matters most for the first paper you sit, because that is the one you will treat, without deciding to, as your true position. Reading a baseline properly is hard enough with good material. With a paper of uniform difficulty it is not really possible, and the number you carry away can distort weeks of planning.
What to do with a paper that does not pass
Failing a check is not a reason to delete the file. It is a reason to demote it.
Material you do not trust is still usable for method work: take single task types, work them untimed, and use them to rehearse procedure rather than to measure standing. What such a paper should not be given is a scored timed sitting, because the scarce resource in dMAT preparation is not practice questions but credible ones — papers you have never seen, close enough to the real format that the result means something. Spend those deliberately; what to do when you run out of mocks is largely about the situation you create by spending them carelessly. If you want a reading you can rely on before committing an afternoon to an unknown paper, a timed run of the free dMAT practice test is a reasonable place to start, and sitting it under realistic conditions is what makes one mock score comparable to the next.
The short version
None of this needs expertise you do not have. Structure against the official description, three explanations read properly, two items solved and checked against the key, a glance at the spread of difficulty. Ten minutes, before the clock starts. The alternative is to spend a full sitting and a day of review on a paper that was never measuring the right thing, and then to plan the month ahead around what it told you.
