The mechanisms of Selor-Hudson abstract reasoning tests (1rst part) and of EPSO-CEE selection tests (2d part) through short, simple and clear explanations, and numerous exercices. For Hudson-Selor tests, a foolproof method that ensures the success and very high scores, either in the "black spots", "dices", ' Fx ' version (7 transformations) or in the "dominoes" version (9 transformations). Thanks to the notation, you should not remember anything . In addition, you realize yourself if you have made a mistake, and you can correct it easily. For EPSO and IQ tests type, you significantly increase your performance thanks to the explanations of recurring mechanisms and to new ways to se...