875 general chemistry actually includes: when preparing for the exam, the knowledge of the first few units (atomic and molecular orbits, basic principles of chemistry, solid structure, solution chemistry) is theoretical. I mainly read books and then sort out my notes. When I went back to review the unit of elemental chemistry, I focused on the PPT of the last class and arranged my notes. In fact, organic chemistry is easy to get points. I read a large edition of organic chemistry book in the early stage, including organic reaction, organic synthesis (985,211year), organic identification (self-sorting, very comprehensive), organic inference (problem-solving thinking), organic experiment (including distillation, vacuum distillation, steam distillation, recrystallization, chromatography and so on).