First of all, no matter Xiao Bai or the basics, if you want to practice doing problems, you must first learn the basic knowledge, which is very helpful for the understanding of the second-level problems. If you lay a good foundation and understand each module in place, it will be much easier to practice the purpose of doing the problem. According to the structure of the second-level question bank, the questions after 18 sets are the focus of future exams. When practicing, you can quickly go through the first 18, so you don't have to do simple questions repeatedly. If you don't understand, you can take a note and practice again and again. /kloc-after 0/8 sets, you must practice carefully and be familiar with each set.
The operation problem accounts for 80 points, so it must be done by hand. If you lay a good foundation and practice for three hours every day, you can easily win the second grade. I suggest you brush some multiple-choice questions one week before the exam. You don't have to recite them. Just give the impression that you can choose the right exam.