Version A mainly aims at the basic questions, systematically and comprehensively explains the knowledge in the textbook and explains the real questions of the college entrance examination in recent years.

Version B is mainly an exercise, but it is also an exercise, but most of them are college entrance examination questions, and the college entrance examination questions are excellent!

Therefore, version A is suitable for students who have a weak foundation and need to learn the basics, as well as students who want to pass the exam.

There is no problem with the foundation of version B, and we are beginning to move towards 100.