Police Sergeant Exam
Free mock exam

National Investigators' Exam (NIE) practice

875 original questions · mock format 80 questions in 120 minutes · pass 45/80 (56%). Read the full exam guide

Real exam pass mark: 55.7% (39 of 70 marked questions) in the 2026 handbook.

Free

Start with the diagnostic

20 questions across the syllabus in 30 minutes. Shows your weakest areas.

Free

Quick practice (20 questions)

Instant feedback and the explanation after every answer.

Timed mock exams

Each mock has 80 questions in 120 minutes, spread across the syllabus areas like the real exam. Aim for 66% or more on three different mocks: the pass mark plus a margin.

  1. FREEMock 1
  2. PROMock 2
  3. PROMock 3
  4. PROMock 4
  5. PROMock 5
  6. PROMock 6
  7. PROMock 7
  8. PROMock 8
  9. PROMock 9
  10. PROMock 10

Practice by topic

Every topic quiz is free on its free questions. Pro opens every question in the topic.

Crime

Evidence and procedure

General police duties

Exam checklist

  • The National Investigators' Exam (NIE) is for trainee detective constables, detective degree holder entry (DHEP) candidates and PIP2 investigators. Your force registers you for a sitting.
  • The NIE runs four times a year; 2027 sittings are expected in March, June, September and November. Confirm each date and registration deadline on college.police.uk.
  • The exam is 80 multiple-choice questions in 2 hours, marked out of 70. The 2026 handbook set the pass mark at 55.7% (39 of 70) for the year; the College can change it.
  • The syllabus is the Blackstone's Police Investigators' Manual 2027, parts 1 to 4. Revise from the 2027 edition.
  • Read the College of Policing candidate handbook for the exam rules (ID, room, equipment) before the day.
  • Our 80-question mocks use a 45 of 80 (56%) target. Check every legal point against your 2027 manual: this site is an independent revision aid, not affiliated with the College of Policing.