Aid for the school book of the B 'Gymnasium. 

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

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

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