Junior high school only requires mastering common English usage, mathematical theorems, the reaction process of chemical reactions or the appearance of chemical substances, and mastering the estimation of common physical phenomena and preliminary physical phenomena.

High school is relatively deep. English grammar, vocabulary and part of speech, western cultural habits (more reflected in article reading); Mathematics has also deepened (I won't say specifically); In chemistry, we should not only understand the phenomenon of chemical reaction, but also understand how and why it happens. Explain physical phenomena and understand physical principles;

Contrast: junior high school seems to know this; High school is like knowing how this fact happened.

If you don't understand: going to college or graduate school is like knowing the whole story, how it happened, why it happened, how to avoid it and why.

Study and tell me more why. . . . .

Learning should be done: know why. . . (Learning method, a bit general)

It's a little far-fetched I hope it works for you.