1, I think the series is a difficult one-compulsory five (the most difficult problem in the college entrance examination is the series), and then compulsory-the function is the most important-(including the trigonometric function of compulsory four)-and the conic curve of 1- 1 is also difficult to choose-I learned the geometry of compulsory two. In fact, nothing will be too difficult as long as you do more math.

2. Personally, the order of difficulty is: compulsory 2 solid geometry compulsory 5 series compulsory 1 function compulsory 4 trigonometric function compulsory 3 program questions.