Personally, I think it's better to do it all. The 660 questions in this book are good, with comprehensive test sites and detailed answers. This book has been done twice, and then 100 (660 questions are fill-in-the-blank and multiple-choice questions, and 100 questions are big questions, published in mid-September). After these two books are finished, it will be very easy to read the real questions.

PS: Actually, there are not many books on mathematics. Reviewing the whole book +660 questions+100 questions+real questions is easy to get a score of 120+ (of course, I got three exams, which may be more difficult), and 400 questions BT, which makes me feel too difficult. I can do it or not.