How Many Past Papers Should I Do?
There is no set number of Leaving Cert past papers. What counts is syllabus coverage and marking each paper, and early on the unit is the topic.
ExamAI Team6 min read 
There is no set number. What decides whether you have done enough is how much of the examined course you have met in past questions and then corrected, so two students working properly can stop at different totals. A paper you sit and never mark moves that count very little, because the marking scheme holds the part you did not already know. Early in the year the useful unit is a topic across several years, and a full paper becomes useful once you have covered enough of the course to attempt most of it.
How many papers there are
Our past paper finder lists Leaving Cert maths papers for every year from 2007 to 2025, and maths is examined in two written papers each June. Every paper and every marking scheme is free from the State Examinations Commission, so supply is not what limits you.
Part of that back catalogue was set for a different course or a different paper structure, which is the first thing to check before you count years.
Some of those papers describe a different exam
The SEC prints two warnings on its Exam Material Archive page. One is about the course: "In subjects where the syllabus has changed the papers for the years preceding the change are shown for reference purposes only, they are not based on the current syllabus." The other is about the shape of the paper: "The examination papers from 2021 were adjusted to compensate for disruptions to learning due to COVID-19 and does not necessarily reflect the same structure and format as the examination papers of other years."
Higher Level maths shows both. In June 2012 the SEC set two different Higher Level Paper 1s. One reads "Attempt SIX QUESTIONS (50 marks each)" and has no sections at all (2012 Paper 1). The other is headed Project Maths, Phase 3, and splits 300 marks into Section A, Concepts and Skills, and Section B, Contexts and Applications (2012 Project Maths Paper 1, page 2). Only the second layout survived.
The amount you answer has moved since as well.
| Higher Level maths, Paper 1 | Marks | What you answer |
|---|---|---|
| 2019 | 300 | all nine questions |
| 2021 | 220 | four of six in Section A, two of four in Section B |
| 2025 | 300 | five of six in Section A, three of four in Section B |
The 2025 paper still carries the Covid adjustment notice on its cover. So the pool of papers that match the exam you will sit is smaller than the pool of papers that exist, and the older ones are still worth working through for the questions themselves.
Biology is the clearest case of a structure change right now. The papers up to 2026 are 400 marks over three hours in Sections A, B and C, and from 2027 the written paper is 300 marks alongside a 200-mark investigation. The content overlaps heavily and the layout does not, which our post on getting a H1 in Biology works through.
Marking is what a paper gives you
The scheme explains the marks part by part, and the awards are coarser than they look. A ten-mark part on Scale 10D in the 2025 Higher Level maths scheme awards 0, 2, 4, 6 or 10 and nothing in between, and the 6 is the category the scheme calls an almost correct response. Your own script does not show you which of those five you landed on. Our post on how marking schemes work sets out the scales, the biology notation and the English criteria.
Two students who have each attempted eight papers can therefore be in very different positions, and the difference is what came back out of the schemes. A count of attempts hides that, which is why a target number measures progress poorly. The method for sitting and marking one is worth getting right before you scale the number up.
Early on, the unit is a topic
A full paper in October asks you about material your class has not reached yet. A single topic can be worked as soon as it is finished in class, and one topic holds a lot of past questions.
47 of the 208 Higher Level maths questions in our corpus since 2015 involve algebra. In Higher Level chemistry over the same years, 43 of the 121 questions involve organic chemistry. One topic in one subject is already weeks of work at the pace you can mark it.
The topic pages group those questions for you, with the marking scheme beside each one, for algebra in Leaving Cert maths and organic chemistry in Leaving Cert chemistry, among the other strands. Why the same topics keep returning while the wording changes is covered in our post on whether Leaving Cert questions repeat.
A test for when you have done enough
Keep the list of what cost you marks, and carry it from paper to paper. That gives coverage a definition you can check. A freshly marked paper that adds no new item to the list has found nothing you did not already know about your own work.
That is a statement about the papers you have marked so far, and it says nothing about June. It does point at what to do next in both directions. While new items keep appearing, the next paper is earning its time. When the same few items come back every time, the work to do is those items rather than another paper.
Is doing past papers enough?
For the written exams they are the closest measure you have of the real thing. They do not cover everything your grade is made of.
Several subjects settle a large share of the marks before June, in orals, practicals and coursework. Leaving Cert Biology from 2027 is the sharpest example, with 200 of the 500 marks in an investigation due on Friday 26 February 2027. No amount of past paper work touches those marks. Where those deadlines fall across the year is set out in our post on when to start studying, and a plan for a short run-in is in how to study in three months.
Past papers also sample the course, so a topic that has come up rarely still sits on your syllabus. Work from the syllabus for what to cover, and from the papers for how it gets asked.
FAQ
How many past papers should I do? No target number is published by anyone who marks the exam. Work until a marked paper stops adding new items to your list of what cost you marks, and count marked papers only.
How many years of past papers should I do? Start with the most recent years, because they match the current structure. In Higher Level maths the choice on Paper 1 changed between 2019, 2021 and 2025, and the SEC warns that papers set before a syllabus change are published for reference only.
Is doing past papers enough on its own? For a written paper it is the closest practice available. Orals, practicals and coursework are marked separately, and in Biology from 2027 the investigation carries 200 of the 500 marks.
Should I use papers from before 2021? Yes, for the questions themselves. Check the instruction page each time, since the marks, the timing and the number of questions you answer can differ from your own exam.
Is it better to do one paper properly or three quickly? A paper you mark against the official scheme produces a list of specific corrections. A paper you attempt and leave produces a total. Only the first tells you what to study next.
How many past papers should I do per subject? It varies by subject and by where you stand in it. The subjects where your marked percentage sits near a grade boundary are where another paper is worth most, which our post on studying in three months works through with the points grid.
The ExamAI past paper finder gets you any Leaving Cert paper with its official marking scheme in one search, and the subject topic pages group the past questions by topic so you can work through one at a time.