About chemistry: write the chemical equations of the whole book in this book, and write it again when you have time. You should be able to write quite skillfully, remember and be familiar with the special ones, know the phenomenon of each chemical reaction, including the change of color and form, and remember the color and state of chemical substances, such as which substances are solid and which are white precipitates.

About physics: the process of sorting out formulas, being familiar with and able to use them, and making clear the description of topics when doing problems.

About mathematics: it is not enough to sort out equations and formulas. Mainly familiar with how to use, familiar with function images, accurately draw images, and flexibly use images.