"Perhaps the best way to describe my involvement with mathematics is to compare it to the experience of entering a dark mansion. You enter the first dark, completely dark, room. You stumble around and bump into furniture. Gradually, you learn where each piece of furniture is. And finally, after about six months, you find the switch and turn on the light. Suddenly, everything is illuminated and you can see where you were. Then, you enter the next dark room...". This is how Professor Andrew Wiles described his seven-year search to solve Fermat's Last Theorem, the "Holy Grail" of mathematics.

With this book, we aim to safely guide the student through these "dark rooms" of mathematics and help them be able to approach all the problems that arise and successfully solve them.

The methodology we present is written in such a way that the student has the appropriate "tools" in their hands to solve exercises at every level.

The large number of exercises we have included covers all the forms that the student may encounter during the school year, as well as in the national exams.

Considering that success ultimately relies on organized and systematic repetition, we have included review topics and exams at the end of the book so that the student can have a comprehensive review just before their exams."