As a senior one student, I can tell you that the senior high school entrance examination is mostly about senior three, so senior three is very important. Of course, science in senior two is also the focus of the examination. At that time, the examination will focus on mechanics, electricity, buoyancy, pressure and pressure, as well as the photosynthesis of lunar plants and the transformation of respiratory substances (as long as you master the basic things such as chemical reaction, decomposition reaction, metathesis reaction and displacement reaction). Speaking of mathematics, I often get full marks in mathematics. In fact, it is not difficult to learn math in grade three step by step. Compared with the math in grade one now, it is really simple as hell. As long as you attend classes every day, you must do more exercises. To tell the truth, mathematics is so much. It's easy to remember some formulas. The key is to expand some slightly more difficult topics after class. Quadratic function, in particular, is often the last question in the senior high school entrance examination, usually combined with similar triangles or right triangle. Pay special attention to multiple solutions to one problem. There are several different situations. That's all I want to say. As for the second quarter of the second chapter of the third grade, it seems to be the transformation of matter. This is to remember the four basic reaction types and the reaction conditions. There are also ten methods of salt formation, and you can master them well as long as you learn them bit by bit.