1, many questions. There are more questions in 53 sets of mathematics than in 42 sets of mathematics, which is helpful for students to understand the questions and prescribe the right medicine in the exam.

2. foundation. 53 sets of mathematics is a series of books and a problem book, which is mainly based on classroom exercises. Completely synchronized with the textbook, there are basic knowledge exercises and promotion exercises, which are very suitable for students to explore step by step, while 42 sets of questions are relatively difficult.