How to join the British Army: the application process step by step

Joining the British Army is a longer process than most applicants expect, and the aptitude test sits early enough in it to shape everything that follows. This guide walks through the stages, explains where the Army Cognitive Test fits, and covers what is worth preparing for at each point.

ForcesReady is an independent practice resource. We are not affiliated with, endorsed by, or connected to the British Army or the Ministry of Defence. The Army sets and changes its own process — always confirm the current requirements on the official recruitment website or with your Armed Forces Careers Office.

Before you apply

Two things are worth settling before you start, because both affect everything downstream.

Soldier or officer. These are different entry routes with different requirements and different selection processes. If you are unsure which suits you, a careers adviser will talk it through with you — it is the kind of question they answer every day.

Which roles interest you. The Army has a very wide range of trades, from infantry to engineering, medical, logistics, communications and intelligence. You do not need a final answer at this stage, but having a rough direction matters, because the roles open to you will depend partly on your aptitude test score.

Stage 1: the application

You register your interest and submit an application covering your personal details, nationality and residency, health, and any previous convictions. Be straightforward here. Problems in the process are far more often caused by something not declared than by the thing itself.

Expect to be assigned a careers adviser who becomes your main point of contact. Use them. They know the current process in a way that no website, including this one, can guarantee to.

Stage 2: the Army Cognitive Test

This is the aptitude test, and it is the part of the process most within your control. The ACT replaced the older BARB test, so if you find advice referring to the BARB, it is describing the previous version.

It is a computer-based test made up of five short, separately timed sections: Deductive Reasoning, Error Detection, Number Fluency, Word Rules and Orientation. Your result is used to indicate which roles you are suited to, so a stronger score means a wider choice of trades — which is precisely why it is worth preparing for.

Reports differ on exactly where and when in the process the test is sat, and the recruitment process has been restructured more than once in recent years. Ask your careers adviser rather than assuming. Our guide to the Army Cognitive Test covers the sections in detail, and you can try every one free on our ACT practice page.

Stage 3: medical and fitness

You will complete a medical questionnaire and, in most cases, a medical assessment. A large proportion of applications end here, often over conditions applicants did not expect to matter, so it is worth being honest and thorough at the questionnaire stage rather than discovering a problem later.

Physical preparation should start well before this point. Running, strength and general conditioning all take months rather than weeks to shift, and unlike the aptitude test there is no shortcut available.

Stage 4: the assessment centre

The Army's selection event runs over more than one day and combines several kinds of assessment: physical tests, team tasks, an interview, and further checks. It is designed to look at how you perform over a sustained period rather than in one sitting.

The interview is the part most people under-prepare. You should be able to talk about why you want to join, why that particular role, what you know about it, and what you have done to prepare. Vague answers stand out badly.

Stage 5: the offer and basic training

If you are successful you will be offered a role and a start date for basic training. Waiting times vary considerably by trade, so it is worth asking your adviser what to expect for the roles you are interested in.

What to prioritise

Competition for places has been strong in recent years, and the parts of the process you can influence are worth taking seriously:

1. Fitness — the longest lead time of anything here. Start now, not when a date is confirmed.
2. The Army Cognitive Test — the fastest return on effort. It is a speed test, so practising the formats against a clock moves your score in days rather than months.
3. The interview — cheap to prepare for, and consistently under-prepared. Know your chosen role properly.
4. Honesty on the paperwork — declaring something awkward early is almost always better than it surfacing later.

If you are still deciding between services, our comparison of the DAA and the ACT explains which aptitude test each service uses.