What is the British Army Technical Selection Test (TST)? Practice and Examples

For many candidates, the British Army Cognitive Test (ACT) is the main hurdle at the Assessment Centre. However, if you are applying for a technical trade, you face a second, often unexpected challenge: the Technical Selection Test (TST).

For applicants who haven't touched a maths textbook since leaving school, the TST can be a major source of anxiety. In this guide, we break down exactly what the TST is, who needs to take it, and the difference between "cognitive potential" and "hard maths skills."

The Difference Between ACT and TST

It is crucial to understand that these are two separate assessments with different goals:

Army Cognitive Test (ACT): This measures your potential to learn. It tests logical processing, speed, and accuracy. You don't need prior knowledge to pass it; you just need a sharp brain.
Technical Selection Test (TST): This tests your existing knowledge of mathematics. It is essentially a GCSE-level maths exam covering algebra, fractions, and equations. It proves you have the numerical foundation required for engineering or technical training.

Who Needs to Take the TST?

Not every soldier takes the TST. It is reserved for roles that require precise calculation and technical understanding. You will likely sit the TST if you are applying for:

Royal Engineers (RE): Combat Engineers, Electricians, Fitters.
Royal Electrical and Mechanical Engineers (REME): Vehicle Mechanics, Aircraft Technicians, Armourers.
Royal Signals (R Signals): Cyber Engineers, Network Engineers, Electronic Warfare Operators.
Army Air Corps (AAC): Aviation Groundcrew.
Royal Logistic Corps (RLC): Ammunition Technicians.

If you are applying for Infantry or generic support roles, you usually only need to pass the ACT.

What is on the TST? (With Examples)

The TST typically consists of around 55 questions to be answered in 45 minutes. The level is roughly equivalent to a GCSE Grade C (Grade 4/5). You cannot use a calculator.

Here are the key topics you must revise:

1. Basic Arithmetic and Fractions

You need to be comfortable adding, subtracting, multiplying, and dividing fractions without a calculator.

Example: What is 3/4 divided by 1/2?

2. Algebra

Solving for X is a huge part of the TST. You will need to rearrange formulas and solve simple linear equations.

Example: If 5x - 10 = 25, what is the value of x?

3. Scientific Notation and Significant Figures

Technical roles involve very large or very small numbers. You may be asked to convert numbers into standard form.

Example: Write 0.0045 in standard form (4.5 x 10^-3).

How to Prepare: Get Your Brain Back into "Math Mode"

If you have been out of education for a few years, your maths skills may be rusty. The biggest mistake candidates make is assuming they can "wing it." The TST is strict, and failing it will bar you from your chosen technical trade, potentially forcing you to choose a different career path in the Army.

To prepare effectively:

Revise GCSE Maths: Dig out old textbooks or use BBC Bitesize to refresh your memory on fractions and algebra rules.
Practice Without a Calculator: You rely on your phone for maths in daily life. Stop doing that. Practice doing long division and multiplication on paper.
Sharpen Your Numerical Reasoning: While the TST is knowledge-based, the pressure is similar to the ACT. Using our Army Cognitive Test App can help build your numerical reasoning foundations, getting your brain used to working with numbers under strict time pressure.

Conclusion

The Technical Selection Test is a gatekeeper for some of the best careers in the British Army. Don't let a lack of revision stop you from becoming an Engineer or a Cyber Specialist. Treat the TST with respect, revise your algebra, and use our app to keep your mind sharp for the cognitive challenges ahead.