what i do is i use chemnotes its much more simple + i add my class notes to the chemnotes stuff so i know it covers everything
then i bring my CGP revision guide in class so if i'm confused or if the teacher doesnt explain it well i can read a paragraph and understand it and also sound smart when the teacher asks questions about things we havent learnt yet lol x)
edit: i didn't know Tywin Lannister made a level chemistry videos lol