How to pass the NIE
A plain look at what the National Investigators' Exam actually asks of you, where the pass mark comes from, and what a realistic run-up to your sitting looks like — sourced from the College of Policing's own candidate handbook, not guesswork.
What the NIE is
The National Investigators' Exam (NIE) is the second phase of the Professionalising Investigation Programme (PIP), and passing it is a prerequisite for progressing to PIP level 2. It is set and administered by the College of Policing, and every candidate sits the same paper on the same day, wherever they're based.
Source: College of Policing, National investigators' exam (NIE).
The format, at a glance
You'll answer 80 questions in a two-hour sitting, but 10 of those are removed from marking afterwards — they're trial questions the College is testing for future papers — so every candidate's result is calculated out of the remaining 70. AI tools of any kind are strictly prohibited during the exam.
Source: College of Policing NIE candidate handbook 2026, sections "Examination structure and syllabus" and "Code of ethics and conduct".
The pass mark, explained
The pass mark is 55.7%, which is 39 correct answers out of the 70 that count. Score 85.7% or higher (60 out of 70) and the result is recorded as an exceptional grade rather than a plain pass. There's no partial credit and no negative marking — an unanswered question and a wrong answer cost you the same single mark.
A pass, once you have one, stays valid for three years less a day, so if a while passes between your NIE and your next step you don't automatically need to resit.
Source: College of Policing NIE candidate handbook 2026, sections "Pass mark" and "Validity".
What it covers
The paper is drawn from four areas, and they're not weighted equally — some come up far more often than others:
- Police powers, procedure and the criminal justice process — the largest area, roughly 31 of the 80 questions. Arrest, detention, PACE and the mechanics of taking a case through the system.
- Serious crime, public order and specialist offences — roughly 23 questions. Offences against the person, public order law and the more specialist end of the criminal law.
- Property, dishonesty and financial-crime offences — roughly 13 questions. Theft, fraud and related offences.
- Sexual offences — roughly 13 questions, covering the relevant offences and procedure.
The syllabus itself is drawn from the current-year edition of Blackstone's Police Investigators' Manual, which is the College's designated reference text — you'll need your own copy of it regardless of how you revise, since nothing else is an authorised substitute for it.
Source: College of Policing NIE candidate handbook 2026, "Structure", and the NIE subject area breakdown, March 2026.
How the College says to prepare
The candidate handbook recommends a minimum of 14 weeks of independent study before your sitting. That's a floor set by the exam's own administrators, not a maximum — it assumes you're starting more or less from scratch and studying consistently across that period, not cramming at the end of it.
Source: College of Policing NIE candidate handbook 2026, "Overview".
A realistic study plan
Most candidates already know the standard advice: read the manual, highlight it, read it again. What that misses is that recognising a fact on the page and producing it under exam pressure are different skills — rereading builds familiarity, not recall.
A more realistic run-up over your 14-plus weeks looks like this: read a topic in the manual, then test yourself on it repeatedly and with real spacing between tests rather than all at once, then sit full-length mock papers close to your exam date so the two-hour format itself stops being a surprise. That's the gap NIE Revision is built to fill alongside your reading — short daily sessions across all four weighted areas, scenario-format practice questions, and mock exams that mirror the real paper's 31/23/13/13 split, with an honest readiness estimate against the 55.7% pass mark as you go.
What happens if you don't pass first time
Resit arrangements are set by your own force or organisation, not by a single national rule — check with your force's NIE liaison contact for the specifics that apply to you. What the handbook does set nationally is what happens after repeated fails: a development meeting is expected after a second fail, to look at what went wrong and plan the next attempt, and a third fail typically triggers a wider review of your investigative career pathway.
Source: College of Policing NIE candidate handbook 2026, "Resitting the NIE".
Frequently asked
How is the NIE pass mark worked out?
The NIE is 80 multiple-choice questions, but 10 are removed from marking after the exam, so every candidate is actually scored out of 70. The pass mark is 55.7 percent, which works out at 39 correct answers out of that 70. Score 85.7 percent or above and the result is recorded as an exceptional grade.
What does the NIE actually cover?
Four areas, weighted differently: police powers, procedure and the criminal justice process is the largest at roughly 31 of the 80 questions; serious crime, public order and specialist offences is next at roughly 23; property, dishonesty and financial-crime offences and sexual offences each make up roughly 13.
How long should I spend revising for the NIE?
The College of Policing's own candidate handbook recommends a minimum of 14 weeks of independent study before your sitting. That is a floor, not a target — how much more you need depends on how confident you already are with the four syllabus areas.
What happens if I don't pass the NIE first time?
Resits depend on your own force's policy, not a fixed national rule. After a second fail you can expect a development meeting to look at what went wrong, and a third fail typically triggers a wider review of your investigative career pathway. A pass, once achieved, stays valid for three years less a day.
Practise the way the exam is actually marked
NIE Revision is 513 revision cards and 769 scenario-format practice questions, weighted the same way the real paper is, with mock exams and a readiness estimate against the 55.7% pass mark. £15 one-off, founding price until 31 August 2026.