Biology + Chemistry am I cooked?

Basically I'm taking both APBio and APChem and I have completed the Chem college board videos, but I have a lot of topics I don't understand, I'm not sure what papers I have to practice on and what's the most efficient and effective way

For Biology however, I haven't done the videos yet because I was busy with Chem, but in school we've done almost 5 Units and had tests on them because we follow the AP Topics, just not in order so I only need to review them as well as do the rest of the units that we haven't taken because the school year wasn't enough, the issue is that we haven't done any APChem in school, now I'm unsure on how to review for Biology during my time now or should I wait till after APChem, only 10 days left then?

Needing tips and study guide help for Chem and Biology please, thank you.