The Army Cognitive Test — the ACT — is a computer-based assessment used in British Army recruitment. It produces a single number, your GTI score, and that number affects which roles you are eligible to apply for.
The ACT is not a knowledge test. There is no syllabus to revise and nothing to memorise. It measures how quickly and accurately you process information under time pressure.
That distinction matters, because it changes how you prepare. You cannot cram facts for it. What you can do is get faster and more accurate at the specific question types, which is exactly what practice achieves.
The test is split into five sections, each targeting a different kind of processing:
What it is: You are shown two strings of characters — numbers, letters or symbols — and must count how many characters differ. The answer can be 0.
What it tests: Visual accuracy at speed. Transposed digits and near-identical characters are the usual traps.
Tip: Compare in small chunks rather than reading the whole string. Most errors are a swapped pair, not a wholly different character.
What it is: You work out two short sums and say which gives the bigger answer, or whether they are the same.
What it tests: Mental arithmetic speed rather than mathematical difficulty — it is about how fast you calculate, not how advanced the maths is.
Tip: Estimate first, because many pairs are far enough apart that you do not need the exact figures. Work out the close ones properly, and remember "same" is a real answer.
What it is: You are given three categories and three words, and count how many words belong to the category in the same position.
What it tests: Holding a rule in working memory and applying it consistently under time pressure.
Tip: Check each word against its own position only. A word can fit one of the categories and still not count if it is in the wrong place.
What it is: You are given a set of ordering statements and must work out what follows — what comes first, last, or in a given position.
What it tests: Logical sequencing. The information is always sufficient; the difficulty is assembling it quickly.
Tip: Sketch the order as you read rather than trying to hold it in your head. On paper or mentally, fix the chain before looking at the answers.
What it is: Spatial questions involving direction, rotation and relative position.
What it tests: Mental rotation and spatial awareness — the ability to picture how something looks from a different angle.
Tip: Pick one fixed reference point and rotate everything relative to it, rather than trying to rotate the whole picture at once.
Your performance across all five sections produces a General Trainability Index — the GTI. It runs from 26 to 60.
26 is the minimum standard to progress. 60 is the top of the range and opens the widest set of options. Each trade sets its own requirement in between, so check the specific trade you want.
The critical point most candidates miss: your GTI is set by your weakest sections as much as your strongest. Being excellent at Number Fluency will not compensate for being slow at Orientation, because the score reflects overall processing across all five.
You sit the ACT once. The score you achieve determines the roles open to you at the point you join — and that shapes your entire career path, including which trades you can later transfer into.
Candidates routinely turn up having done no preparation, on the assumption that an aptitude test cannot be prepared for. That is a misunderstanding. The format is fixed and the question types are known, so familiarity alone removes a large part of the time pressure.
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