However, the current trend is that it is difficult to build a department by taking a quiz in the traditional big exam.

Small questions require students' spatial imagination and understanding of solid geometry theorems, and most of them are medium-sized questions.

And big questions can be done by building a system, which can avoid the traditional method of deducting process points, but the results are basically wrong, and no one will look at your normal vector.

I advise you, it is doomed to be a waste of time to buy time for math problems.

If you want to get into a good university, you should remember more inferences, such as the relationship between the length and height of the regular tetrahedron, the radius of the outer ball and the radius of the inner ball.

The equilateral tetrahedron is placed in a cuboid, the opposite side is diagonal and so on.

Suggestion: Flexible use of multiple conclusions can gain time in small questions and leave time for derivative of conic curve.

Do a small problem with a traditional big problem and build a system with it.