This book contains the material for Mathematics, Science, and Technology direction of the second year of high school in a simple, understandable, and methodical way. The arrangement of the material follows the order of the school textbook, making this aid useful for studying, preparation, and deep understanding of daily lessons, as well as for exams of all kinds.

Each section includes:
- The basic theory in the form of questions and answers.
- Solved exercises, methodically organized, accompanied by clarifying comments,
observations, and methodological notes.
- Comprehension questions and exercises for solving, classified by difficulty level, covering all possible cases and necessary for self-action and practice.

After completing the material, general topics for review and review exams are provided. At the end of the book, hints or solutions to all suggested exercises are given.

The functional structure of the book, the detailed presentation of the theory and comments, the number, quality, and range of exercises, as well as its overall composition, make it a useful and effective aid for every student, regardless of how high their goals are.