Should I use textbook outlines to study ?

Well I want to learn AP chem and AP bio before I have to do it in school, But i’m pretty slow so I heard using textbook outlines are a good idea. Except when I saw the outlines I didnt feel to sure because I wasnt sure wether it was good and I didnt grab much.
( The books my school would be using for AP chem and AP bio are Zhumdal and Campbell)

Generally it’s more helpful to develop your chapter outlines so you can highlight the areas you don’t understand.

Also there is some research the suggests the mechanical act of writing actually improves knowledge retention.