// UK selection test practice
Walk into your test knowing exactly what to expect.
Practise in the real format: the same kinds of task, the same number of questions, the same time – and an explanation for every answer.
Army · Royal Navy · Royal Marines · RAF · SIA
Practice for the test you're taking
Each course page shows the test format with sources and lets you try free sample questions before you buy.
// Navy · RAF
Defence Aptitude Assessment (DAA)
- 6 sections
- 8-part full mock test
- Explanation for every answer
Available now
// Security
SIA Door Supervisor
- 4 units
- A mock exam for every unit
- Based on the SIA specification
Available now
How practising with us works
- 01
Learn the format
Every section step by step, without a clock, with an explanation for every answer.
- 02
Timed practice
The real number of questions and the time limit, so the pace feels normal on the day.
- 03
Full mock tests
Sit the whole thing under test conditions and see where you still lose marks.
- 04
An explanation for every answer
Each explanation shows how to get there, not just which option was right.
Choose your service
British Army
Army Cognitive Test – and officer selection next.
Royal Navy, Royal Marines & RAF
Defence Aptitude Assessment for all three.
Security industry
SIA door supervisor licence exams.
Next on our list
We're building these courses now. Tell us which one you need first.
- Emergency Care Assistant · coming soon
- Border Force Officer · coming soon
Why you can trust what you read here
Facts with sources
Every number on this site – questions, time limits, pass marks – links to where it comes from. Where the services publish nothing official, we say so.
Clear about what we are not
We are not part of any service or licensing body, and our questions are not the real ones. They are written to match the format, so the real thing feels familiar.
Made by an education company
Uniformed Services Prep is a service of Plakos GmbH in Lübeck, which builds online training on its learning platform PlakosAI.
Questions about our practice tests
Are these the real test questions?
No. Every question is our own, written in the format of the real test: the same kinds of task, the same number of questions and the same time per section, wherever these are published. Nobody can legitimately sell you the real questions.
Are you connected to the British Army, the RAF, the Royal Navy or the SIA?
No. Uniformed Services Prep is independent practice material from Plakos GmbH, an education company. We are not affiliated with or endorsed by any armed service, police force, government department or licensing body.
How do I get access after I buy?
You buy the course on our shop. Afterwards you receive an e-mail with your access, and you practise in your web browser.
Can I practise on my phone?
Yes. The course runs in the browser on a phone, tablet or computer. If your real test is taken on a larger screen, do at least one full mock test on a laptop or tablet before the day.
Do you guarantee that I will pass?
No – and be wary of anyone who does. What we promise is that you will know the format, the pace and the kind of questions to expect, with an explanation for every answer.