National investigators' exam past papers — what actually exists
Candidates search for this constantly, so here is the honest answer rather than a page pretending to have found what doesn't exist: there are no public past papers for the national investigators' exam, and there never are.
The straight answer
The College of Policing does not release past papers for the national investigators' exam. The reason is straightforward: the questions remain the College's intellectual property, and the College reserves the right to reuse them in future sittings. Publishing a paper could mean publishing questions candidates go on to sit.
The candidate handbook goes further than simply not publishing papers — candidates are explicitly forbidden from discussing exam content after their sitting. Breaching that can mean having your result removed, and being barred from sitting the exam again for two or more years.
Source: College of Policing NIE candidate handbook 2026.
What the College does release
Two things exist, and neither is a past paper.
- A retrospective subject-area breakdown, published after each sitting, listing the syllabus headings that were tested — for example the March 2026 subject area breakdown. The College attaches its own explicit caution to this document: it is valid only for that specific sitting, and must not be used to predict what a future exam will cover.
- A gated Knowledge Hub group for registered candidates, accessed via your force's liaison contact, which holds practice questions and revision guidance. It isn't public, and isn't a set of past papers either — it's revision material the College curates for candidates already registered to sit.
Source: College of Policing NIE candidate handbook 2026; subject area breakdown, March 2026.
What exists instead
Because there's no official past paper, what candidates actually use falls into two categories.
Blackstone's Police Investigators' Q&A and Mock Examination Paper are third-party study aids sold alongside the manual. The candidate handbook itself notes that these are developed outside the College, and explicitly states they cannot be presumed to represent the real exam's question style or difficulty.
Beyond that, several commercial providers sell question banks and mock exams, priced and licensed differently from each other — see every NIE revision option compared for the current list and prices.
Source: College of Policing NIE candidate handbook 2026.
One honest caveat, worth saying plainly
The College's caution about third-party materials — that they can't be presumed representative of the real exam — applies to every commercial product on the market, including NIE Revision. No provider, including this one, has seen the live paper. What a good mock exam actually gives you is the format: the right number of questions, the same two-hour limit, and a mix of topics weighted the way the real paper is (roughly 31/23/13/13 across the four syllabus areas). It gives you timing practice and recall training under realistic conditions. It does not, and cannot, give you the real questions.
Frequently asked
Can I get national investigators' exam past papers anywhere?
No. The College of Policing does not release past papers, because the questions remain College intellectual property and may be reused in future sittings. Candidates are also forbidden from discussing exam content after their sitting, with sanctions up to having a result removed and a ban of two or more years.
Are Blackstone's Q&A books real past papers?
No. Blackstone's Police Investigators' Q&A and Mock Examination Paper are third-party study aids. The College's own candidate handbook notes they are developed outside the College and cannot be presumed representative of the real exam's question style or difficulty.
What is the closest thing to a national investigators' exam past paper?
A format-faithful mock exam — the right number of questions, the right time limit, and the same weighting across syllabus areas — plus the College's own retrospective subject-area breakdown, which lists the headings tested at a given sitting but comes with the College's explicit warning that it must not be used to predict future exams.
Can I discuss the exam questions after my sitting?
No. The candidate handbook forbids discussing exam content after your sitting, because the questions remain College intellectual property and may be reused. Breaching this can lead to your result being removed and a ban from sitting the exam again for two or more years.
Practise the way the exam is actually marked
NIE Revision is 513 revision cards and 769 scenario-format practice questions weighted like the real paper, with mock exams and a readiness estimate against the 55.7% pass mark. £29 one-off, no subscription, no expiry.