This book is not designed to be a teacher's support, that is, it does not serve as a guide for the entire school year. It is specifically designed to support the student to reinforce the issues he has seen during his time in school, working with greater emphasis on the points that traditionally cause difficulties.

Given the previous idea, the agenda has been divided into 9 chapters, in which different aspects are worked through problem solving. Each problem requires certain knowledge that will be remembered in the course of the solution.

After each chapter several exercises are left for the student to do on their own and the solutions are given, step by step, at the end of the book. It is imperative that the solutions are consulted only after having solved the problem, to compare their solution.