So, you’ve applied for the Nigerian Correctional Service (NCoS) recruitment and now you’re wondering how to ace the screening exam?

Good news—you’re not alone. Thousands of applicants across Nigeria are preparing just like you. The secret to standing out is practicing real past questions and understanding what to expect.

In this guide, we’ll give you:

• Authentic sample questions and answers

• Subjects to focus on

• Smart tips to boost your confidence

What Subjects Are Covered in NCoS Exams?

The NCoS recruitment exam usually follows a Computer-Based Test (CBT) format and covers these four main areas:

1. English Language

2. Mathematics

3. General Knowledge & Current Affairs

4. Nigerian Correctional Service-Specific Knowledge

Each section is designed to test your basic reasoning, literacy, and understanding of the job role.

Sample NCoS Past Questions and Answers

Here are real examples from previous NCoS recruitment exams to help you prepare:

English Language

Q1: Choose the synonym of “Swift”
A. Slow
B. Quick
C. Lazy
D. Soft
✅ Answer: B. Quick

Q2: Fill in the blank: “The officer _____ arrested the suspect was praised.”
A. which
B. who
C. whom
D. whose
✅ Answer: B. who

Q3: Opposite of “Generous”?
✅ Answer: Stingy

Mathematics

Q1: What is √144?
✅ Answer: 12

Q2: Find 25% of 320
✅ Answer: 80

Q3: Solve: 5x + 10 = 35
✅ Answer: x = 5

General Knowledge & Current Affairs

Q1: What is the former name of the Nigerian Correctional Service?
✅ Answer: Nigerian Prisons Service

Q2: In what year was the service renamed to NCoS?
✅ Answer: 2019

Q3: Who is the current Controller-General of Corrections (as of 2025)?
✅ Answer: Haliru Nababa

Q4: What are the four main duties of NCoS?
✅ Answer: Custody, Rehabilitation, Reformation, Reintegration

Correctional Service-Specific Knowledge

Q1: Which ministry oversees NCoS?
✅ Answer: Ministry of Interior

Q2: When was the first prison in Nigeria established?
✅ Answer: 1872 (Broad Street Prison, Lagos)

Q3: Under which law was the NCoS created?
✅ Answer: Nigerian Correctional Service Act, 2019

Tips to Pass the NCoS Recruitment Exam

Here are smart ways to increase your chances of passing:

1. Practice Regularly

Set aside 1–2 hours daily for mock tests and practice.

2. Know the Structure

Understand how many questions to expect and the time limit.

3. Focus on NCoS-Related Topics

Many applicants ignore questions about the Correctional Service. Don't make that mistake.

4. Update Yourself with Current Affairs

Be familiar with recent national events, security updates, and government appointments.

5. Simulate the Real Exam

Use a phone, tablet, or PC to practice CBT-style tests.

Where to Find More NCoS Past Questions

You can find detailed question banks from trusted online sources like:

• Scribd Document: “NCoS 100 Past Questions & Answers”
  Covers English, Math, General Knowledge, NCoS history and structure.
  ➤ View on Scribd

• Practice Questions (1–100)
  Excellent for CBT exam drills.
  ➤ View on Scribd

Quick Summary Table

Frequently Asked Questions (FAQs)

Q1: How many questions are on the NCoS CBT exam?

Typically around 100 questions, to be answered in 60 minutes.

Q2: Are calculators allowed in the exam?

No. Basic arithmetic is expected to be solved mentally or manually.

Q3: What happens after passing the exam?

You’ll be invited for medical screening and eventually proceed to training if selected.

Q4: Do questions repeat?

Yes. Many past questions are recycled or modified slightly—practicing them gives you a huge edge.

Final Thoughts

The NCoS recruitment exam isn’t too difficult, but you must prepare wisely. With a combination of real past questions, consistent revision, and a focus on Correctional Service content, you'll greatly improve your success rate.

Don’t wait until the last minute—start practicing now, and you’ll be ready when the time comes.