This book will be an excellent help for parents and children who have difficulty completing homework in biology, chemistry and physics. It clearly explains the basic concepts from courses in botany, zoology and human anatomy; topics from the sections of inorganic and organic chemistry; the fundamentals of the study of molecules, thermodynamics, electricity, electromagnetism, optics and astronomy from the physics course. Thanks to visual diagrams, diagrams and illustrations with detailed explanatory notes, parents and students will be able to better understand and master topics that are difficult for them.