Need help for french

I have a french exam coming up in 4 days and I am kinda freaking out rn. I study from home and so I don't have a teacher to properly explain all this stuff and I don't understand most of what's in my textbook. Could someone please help me out and give me some tips or something? I especially struggle with all the different times and what verbs I need to know. Obv there's other stuff but I feel like those are the most important ones. Thank you!!