140 depends on probability. I also got full marks in senior three, and I often got scores above 140 (I am from Huanggang). If you want to test 140, you must first have a solid mathematical foundation, and then you must have your own set of learning methods. In the third year of high school, you must review regularly, choose your lectures, be able to think of problems, and draw inferences from others. You must understand the problems you have done and don't make mistakes next time.