What should I do if I only get about 50 points in math in the third year of high school?
It's impossible not to read textbooks. The key is how to read books → You prepare several sets of simulated test papers, and start with the first question at random to see if you can't. If you can't, it means that you lack this knowledge. Then, look at the textbook, just look at this aspect, look at the paper when you understand it, and do it for this type of questions, so that the results will definitely improve. Come on!