The collection part focuses on the understanding of concepts; Now, if you are a freshman again, you must not expect to understand a piece of knowledge by doing problems, which is quite dangerous. First, you must be familiar with the teacher's notes and textbook exercises! Then you can find extracurricular exercises to do. Senior three is the season to do problems. If you don't understand the basic concepts of senior one thoroughly, it's useless to do the previous questions.

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Five-year college entrance examination