I just finished the exam this year, which was recommended by my teacher. There are mid-term exam papers from all over the country, as well as classic questions from local publishing houses in previous years. The result is not very effective. After all, the questions all over the country are written in different ways, so I still have to go to the bookstore to compare them myself. I haven't finished the new lesson of chemistry. It will be easier to do basic problems for half a year and then kill big problems for half a year. Actually, there is no need to worry. It is very important to learn the current class well. Come on, Sao nian.