In fact, no matter what subjects, we should grasp the concept, that is, those theorems infer the definition, and remember that many topics will use the definition method, that is, according to the definition. There may be few junior high schools, but there must be. These are very important.

Historical biogeography is memory, but memory requires skill. This skill is to systematically study and plan the learned knowledge into a relatively complete system, just like a towering tree, with branches, but the trunk is well grasped, and everything is not a problem. I believe that 90% of people will agree with this view. Anyway, the teachers who have taught me all say that we should study systematically, so that our study will be organized and our review will be easy. For example, history is usually arranged in chronological order. When some important events are inserted into the chronology, the whole book is sorted out bit by bit according to the chronology. This is a system. After reviewing according to the chronology, the vague knowledge is easy to strengthen.

I wish I could help you,