This book will help you to prepare numerical reasoning tests for any competition or selection procedure, especially to work in the EU institutions - EPSO Administrators (AD), Assistants (AST), and calls for contract agents (CAST). This is the second volume in our numerical reasoning tests collection, but can be used independently. The book includes an explanation of our method to solve these exercises, many tips, recommendations, and shortcuts, as well as a review of basic mathematical properties, operating with fractions and percentage variations. We will also study in depth a series of 15 sample exercises, very similar to the ones that you are going to find in the real exam, guiding you step-by-step along the process that will allow you to get to the right answer of every question in the fastest and easiest possible way. The author is an economist and successful candidate in the reasoning tests of the highly competitive EPSO AD cycle (generalists and Audit profiles) and the EPSO CAST Administration/HR FG IV, being an official at the public administration in Spain and having held several positions as a head of unit from 2009 to the present. He has also worked as a national expert at the European Commission, provided training to civil servants, coached many candidates for open competitions and several EPSO CAST profiles, and written books for this purpose.