The second volume of the seventh grade is to lay the foundation. You must learn algebra expression operation, parallel lines, data acquisition, probability, axisymmetric graphs and simple functions. As long as you listen carefully in class and do more questions after class, there will be no problem. If it is difficult, it is that the triangle is congruent with the triangle. For students who are new to geometry, it takes some effort to get about 30 to 45 points in the senior high school entrance examination.