Common DAA Mistakes and How to Avoid Them

Most people who underperform on the Defence Aptitude Assessment (DAA) do not fail because the questions are impossible. They fail because they walk into avoidable traps — habits and oversights that quietly cost marks across the RAF and Royal Navy sitting. The good news is that every one of these mistakes has a straightforward fix. Below are the most common DAA mistakes we see, and exactly how to avoid each one.

Preparation mistakes

1. Not practising under timed conditions

By far the biggest error is revising in a relaxed, untimed way and only discovering the pace on the day. Each DAA section is tightly timed, and if you have never felt that clock, it comes as a genuine shock — you freeze, rush, or run out of time on questions you could easily have answered.

The fix: always rehearse against a timer so the tempo feels normal, not alarming. Sit full sections at the real pace using our practice tests until working at speed becomes second nature.

2. Not knowing the format in advance

Turning up unsure how many sections there are, what each one asks, or how the questions are laid out wastes precious seconds while you work out the rules. That confusion is entirely preventable.

The fix: learn the structure before test day so nothing is unfamiliar. Read how to prepare for the DAA, then confirm what you have learned by working through realistic questions for every section.

3. Relying on a calculator during prep

The numerical section is done without a calculator, yet many people revise with their phone in hand. When the crutch is removed on the day, their mental arithmetic feels slow and shaky under pressure.

The fix: put the calculator away now. Drill times tables, fractions, percentages and ratios in your head a little most days so the numbers come quickly and confidently.

4. Neglecting the technical sections

Because the mechanical and electrical comprehension sections feel less familiar, candidates often skip them and hope for the best. Those marks then vanish — even though the content is only applied everyday physics, not advanced theory.

The fix: practise every section, especially the ones you like least. Learn the basics of gears, levers, pulleys, forces and simple series and parallel circuits, and rehearse reasoning through the diagrams.

Mistakes on the day

5. Using outside knowledge in verbal reasoning

The classic verbal reasoning trap is answering based on what you already know or what seems likely, rather than on the passage alone. This is how people miss the correct "Cannot say" response — the text simply does not prove the statement, even if it feels true.

The fix: judge each statement only on the words in front of you. If the passage does not strictly support a conclusion, the honest answer is "Cannot say" — resist the urge to fill the gap with your own assumptions.

6. Rushing and making careless errors

Especially in the work rate section, people equate speed with success and start racing, only to slip on simple questions. Accuracy matters just as much as pace — a fast wrong answer scores nothing.

The fix: aim for a steady, controlled rhythm rather than a frantic dash. Read each question properly, and let timed practice teach you the fastest pace you can hold without your accuracy falling apart.

7. Leaving questions blank

When time is short, many candidates leave difficult questions untouched. If guessing isn't penalised, that is simply throwing marks away — an unanswered question can never score.

The fix: if there is no negative marking, never leave a question blank. Eliminate any obviously wrong options and make a sensible, educated guess. A reasoned guess beats an empty box every time.

8. Poor logistics and a flustered start

A strong candidate can still underperform after a bad night's sleep, a rushed journey, or by half-listening to the instructions and missing something important. Nerves multiply when you arrive in a panic.

The fix: sleep well beforehand, plan your journey with time to spare, and arrive calm. When the assessment begins, read and listen to every instruction carefully before you start — those first few seconds set the tone.

Turning mistakes into marks

Notice the pattern: almost none of these mistakes are about intelligence. They are about preparation and habits, which means they are firmly within your control. Rehearse under the clock, learn the format, drop the calculator, cover every section, judge verbal questions on the passage alone, prize accuracy alongside speed, guess sensibly rather than leaving blanks, and sort your logistics. Do that and you remove the traps that catch most applicants. Build the right habits now with our free practice tests and the step-by-step plan in how to prepare for the DAA.

Please note: this is an independent practice resource and is not affiliated with or endorsed by the RAF, the Royal Navy or the Ministry of Defence.