What psychometric tests measure
Psychometric testing covers two distinct categories that employers often use together: ability tests, which measure how you reason with numbers, words, and diagrams under timed conditions, and personality questionnaires, which measure how you tend to behave and make decisions at work. Ability tests have right and wrong answers; personality questionnaires do not, but they are still scored against a profile the employer has built from people who succeed in the role.
Large graduate employers, banks, consultancies, and the civil service typically use psychometric testing at the earliest screening stage, before a human ever reviews the application. A candidate with a strong CV can be filtered out entirely at this stage, which is why treating psychometric tests as a serious hurdle rather than a box-ticking exercise matters.
Ability tests versus personality questionnaires
Ability tests are timed and objectively scored: numerical reasoning (interpreting data and calculations), verbal reasoning (evaluating written statements as true, false, or cannot say), and diagrammatic or logical reasoning (identifying patterns in sequences of shapes). Speed matters as much as accuracy because most candidates cannot complete every question in the time allowed, and the test is designed that way deliberately.
Personality questionnaires ask you to rate statements about how you typically behave, such as your preference for structure versus flexibility, or how you respond under pressure. There is no universal correct answer, but there is a wrong strategy: trying to guess what the employer wants and answering inconsistently across similar questions. Most personality tests include built-in consistency checks that flag contradictory answers, which can count against you more than an honest but slightly less "ideal" profile.
Common mistakes candidates make
Sitting an ability test cold, without any practice under timed conditions, is the single biggest reason capable candidates score poorly. The format itself, not the underlying maths or vocabulary, catches most people out: working quickly while reading questions on screen and managing a countdown clock is a skill that improves fast with practice and barely at all without it. On personality questionnaires, over-thinking each statement and trying to reverse-engineer the "right" answer tends to produce inconsistent, less reliable responses than simply answering honestly and quickly.
How to prepare in the week before your test
Book at least three to four practice sessions with realistic, timed ability tests in the numerical and verbal reasoning formats the employer uses (most publish which provider they use, such as SHL, Talent Q, or Cubiks). Time yourself strictly and review every wrong answer to understand the trick, since the same question types repeat across different numbers. For personality questionnaires, answer in one sitting without long pauses, and answer as your genuine working self rather than an idealised version, since inconsistency scores worse than an honest, coherent profile.