(1) is relatively easy, and basically everyone can work it out.

Question (2) is a bit difficult, but if you think about it carefully, most students can work it out.

Question (3) is the most difficult, mainly by practicing exercises in this area at ordinary times, and only in the examination room can we play our own level.

There are many functions in the final exam, mainly quadratic functions and application questions. It is often associated with the registration and problem of the position relationship of isosceles triangle, similarity, congruence, circle and straight line. If it's geometry, it's often a moving point problem.

"Reference" is the last question in the senior high school entrance examination over the years, which is very classic.

You might as well buy your own books and do them at home.