If you are a freshman, you should take the entrance exam 1, 2, 4, 5. Compulsory 1 mainly includes sets and basic elementary functions (power function, exponential function, logarithmic function). After learning, there will be questions about compound functions, and we will basically examine several elements of functions: domain, range and monotonicity (we must learn sets well and conform to the domain and monotonicity of functions). Compulsory 2 is solid geometry; Compulsory 4 is a trigonometric function (sine and cosine theorem will be tested together with compulsory 5, and you can look at 5 first and then 4), and compulsory 4 also has series and inequalities; Compulsory 5: First of all, trigonometric function surface system and various formulas and trigonometric function image problems (including finding period, symmetry axis, monotone interval, maximum value, image transformation, etc. ), then learn a time vector and turn back to trigonometric function and differential angle formula and double angle formula (remember! There is no formula for multiplying the difference and the difference in the book. You can look up the information and infer for yourself. It is very useful to do difficult problems. There is also an important and useful auxiliary angle formula that is not in the book! ) trigonometric function focuses on formula memory, deformation and application, and is familiar with various problems that are not too big. Study hard and hope to make progress in school.