How about online tutoring for joint education? Are their books+courses true?
Combinatorial education is an excellent professional mathematics team at present, and has been engaged in college entrance examination mathematics for the last five or six years. The published book is my favorite math tutorial book. Unlike other books, their books are carefully understood and attach great importance to the cohesion logic of upper and lower topics, so as long as they read books and do a few questions, they will feel something. After a book has been written for dozens of pages, you will feel that many questions are suddenly enlightened, so you will get special points. Recommend "General Summary of Mathematics Test Questions in College Entrance Examination" to the students of New Senior Three. This book is great. My college entrance examination 15, mathematics 136, all rely on co-teaching books. Unfortunately, they didn't have a math class that year. If they had the current course, they would certainly learn it easier.