The EPSO numerical reasoning test is one of the most demanding hurdles in EU institution selection procedures. Candidates are required to interpret complex data tables, perform multi-step calculations involving percentages, ratios and rates, and reach accurate conclusions, all under strict time pressure. This book provides 100 practice questions designed to simulate the style and difficulty level of the official EPSO numerical reasoning component. Questions are organised into 12 chapters, each preceded by a structured theory section covering the key concepts, formulas and worked examples relevant to that topic.