There is a particular kind of quiet panic that arrives a few weeks before the exam, when you sit down to practise and realise there is nothing left to sit. The material is finite, you worked through it conscientiously, and the full papers that were supposed to carry you to test day are all used up. It feels like preparation has hit a wall. It usually has not. What you have run out of is unseen papers, which is a narrower thing than it first appears, and most of what a mock does for you at this stage does not actually depend on the questions being new.
Work out what you have actually run out of
A mock test does several jobs at once, and only one of them needs fresh questions. It measures where you stand, which does require a paper you have never met. It also trains pacing, builds stamina for a full sitting, rehearses the interface, and exposes gaps in method — none of which care whether you have seen the questions before. When candidates say they have run out of mocks, they almost always mean they have run out of the measuring function, and then stop practising the other four as though those had expired too.
So take stock before you conclude anything. Count what is genuinely untouched: full papers you have never sat, question sets you began and abandoned, and anything in the official preparation materials you skimmed rather than worked through properly. Check the official sources for what is currently available rather than trusting your memory of what you downloaded months ago. And separate the free practice you have already done from material you have not yet opened — if you have only ever sat the free practice test, your supply is not exhausted so much as unexplored.
A paper you have already seen still measures three things
Resitting a used paper is worth doing, as long as you are honest about what the result means. Your score on it will be inflated, sometimes considerably, because recall does a great deal of work even when you do not consciously remember a question — you recognise a shape, the answer feels obvious, and you arrive at it in half the time it first took you. Treating that number as progress is the one real trap here, and it is why a resat paper belongs in your notes as a drill rather than in your run of scores.
What survives the contamination is everything to do with execution. Pacing is real: if you still run out of time on a paper whose answers you half-remember, the pacing problem is severe and worth attacking directly rather than hoping that more papers will quietly fix it. Stamina is real: concentration across a full sitting tends to fail at the same point whether or not the questions are familiar. And method is real, provided you test it honestly — work each question through instead of jumping to the remembered answer, and you will find the ones you can still only reach by recognition. Those are precisely the ones whose method you never actually learned.
Leave as long a gap as you can manage before resitting, and change the conditions rather than repeating them. Sit it at a different time of day, or on a screen if you first worked on paper, so that the exam conditions get rehearsed even when the content cannot be.
Build new practice out of what you already got wrong
Your used papers are not spent material. They are a question bank you have already filtered for difficulty, and the wrong answers in them are worth more than any fresh paper, because they are the questions that defeated you specifically.
The mechanism is delay. Take the questions you got wrong, wait long enough that you cannot recall the working — two or three weeks is usually enough — then redo them cold and timed. The ones you now solve were genuine gaps that have closed. The ones you still cannot solve are the real curriculum for your remaining weeks. If you have kept an error log, this is the payoff for it; if you have not, building one out of your used papers is a better use of an evening than hunting for more mocks. The same applies to any paper you reviewed too quickly the first time, which for most candidates is most of them.
From there, make short timed sets by question type rather than attempting more full papers. The Core module rewards this, because its formats are learnable: a focused half-hour on Latin squares or figure sequences will move you further than a whole paper in which each appears a handful of times. The same holds for graphs and tables in the General Academic module. Ten focused sets will teach you more than the two extra papers you wish you had.
Keep one clean paper back
Whatever you do with the rest, keep one unseen paper for the last stretch. It is the only uncontaminated read you will get on where you stand, and its value disappears the moment you spend it on something a used paper could have done just as well.
Sit it far enough out that you can still act on the result — roughly a week to ten days before the exam is a reasonable compromise — and not in the final few days, when a disappointing number costs you more in confidence than the information is worth. If you have several fresh papers left, space them rather than stacking them. Back-to-back mocks with nothing changed in between simply measure the same candidate twice, and scores vary between sittings enough that two papers in one week can tell you a story that is not true.
Running out of mocks is rarely a supply problem. It is usually a sign that papers were being used as a way of checking on yourself rather than as a way of practising, and the answer to that is not more of them. Work the questions you already have until they stop defeating you, and keep one paper back to tell you whether it worked.
