In mathematics, we must master functions and sequences. Write down the domain of each question first. I suggest that you can buy test questions for investigation, including difficult and error-prone topics. You can also buy 1000 math problems to increase your basic math problems, which is very helpful to you. Some problems are pieced together by these themes. Remember: the most important thing in mathematics is to master error-prone problems and some mother problems (basic problems of sequence, analysis, derivative and triangle). As for the digression, you have accumulated it. You are in the third year of high school.

Every year, more than a month before the college entrance examination, I will buy one exam a month before the exam, which contains a large number of error-prone questions. In a word, I suggest that you accumulate 1000 math problems first, and then buy test questions one month before the exam for investigation, which will improve and make up for your mistakes.