Zhang Yu's Basic 30 is a comprehensive review course for senior high school mathematics, which mainly explains the basic knowledge and methods of mathematics, including functions, elementary functions, solving equations, inequalities, series, mathematical induction and so on. After learning these basic knowledge, practice and exercise counseling are very important. Whether to buy 300 questions needs to be decided according to your own situation.

"300 Questions" is an exercise set for Zhang Yu's "Basic 30 Lectures", mainly to help students consolidate their knowledge and improve their problem-solving skills.