High school mathematics is mainly based on functions, and the college entrance examination accounts for more than 70%.

Set is the basis of learning function,

Equations and inequalities are the means to study functions,

Functions are divided into power function, exponential function, logarithmic function, trigonometric function, inverse trigonometric function and so on, which are rich in nature.

A sequence is actually a function.

Of course, for the college entrance examination, all knowledge is important, such as solid geometry, analytic geometry, vectors, probability and so on.