1, don't worry, you can review the materials according to version 13, with little difference.

2, the focus of learning is to master the basic principles, theories and methods, in fact, the basic content is similar.

3. The score line is based on the total score (single subject reaching the standard), so don't care about the version. The key is to balance the review of the initial subjects and strive to improve the total score on the basis of single subjects.

4. It is suggested to allocate your review energy according to the subjects that can improve your scoring space. Come on! Wish you success!