1, sorting and selecting materials: select the contents to be printed from the relevant materials of junior high school mathematics expansion course. The content includes exercises, charts, formulas or textbooks. In the process of choosing, you should be clear about your goal, whether to print some exercises for practice or some textbooks for review.

2. Scan or take photos: For paper materials, you can use a scanner to convert them into electronic files, or take photos with your mobile phone. For non-paper materials, electronic documents or pictures, they can be directly exported as electronic files.