Aid for the school book of the B' Gymnasium. 

The material is divided into units according to the corresponding school book. Each unit has the following structure: 

• Summary presentation of the unit's elements 
• Theory of the lesson in the form of questions-answers with appropriate examples 
• Solved applications, with study notes, covering every case 
• Questions to answer 
• Exercises to solve 

At the end of the book, there are answers to all exercise questions and solutions to all exercises in the aid, as well as the answers to the questions and the solutions to the exercises in the school book.