The reasoning tests are multiple-choice questionnaires designed to evaluate your logical thinking skills and your ability to understand verbal and numerical information, as well as relationships between abstract concepts that are not linguistic, spatial, or numerical in nature.
Here you can find sample tests in all 24 EU languages to familiarise yourself with the OAT testing platform:
BG ES CS DA DE ET EL EN FR GA HR IT LV LT HU MT NL PL PT RO SK SL FI SV
You can also consult an accessible version of these sample tests.