The second is to take notes. Whether we study by ourselves or follow the teacher, taking notes can help us deepen our memory and organize our thinking. Mathematics is a subject that tests the ability of logical thinking, so it is very important to clarify the thinking. Organizing the contents of textbooks into notes is actually a process of internalizing externally instilled knowledge into one's own thoughts.
The teacher will hardly give you time to digest and practice in class, but whether you can practice after class remains to be said. We should improve our knowledge and content, but we can't practice more, so high math naturally becomes a nightmare for many college students.
Precautions:
In addition, if not, ask the teacher or classmates and ask the teacher after class. The most important thing in advanced mathematics is to be willing to take the time to know your weak knowledge points in time.
Many knowledge points are related to the previous knowledge points. If the previous knowledge points are not clear, then the new knowledge points are also incomprehensible. As long as you are willing to spend time, I believe you can still learn well.