1, sea tactics is the only way to take the exam.

2, how to simplify the sea of questions: only do difficult problems, do not repeat exercises to save time.

Further: How to identify problems or expand the scope of "repeated exercises"? Be sensitive to the test sites, and you will know all these questions if you can do one question, no matter how you change your vest (the sadness of many students is that you don't know similar questions if you change your vest a little).

Further: how to cultivate sensitivity to test sites? First of all, we should read the book well and make clear the formula theorem. Then, look at the example. Examples can teach two things, one is what the topic may be, and the other is how to use formula theorems to solve problems. These two points are actually the two elements of the so-called test center. Focus, sensitivity, induction, accumulation, form a habit, see through the test center at a glance, and instantly judge whether the topic will be done.