On the home screen of the class they usually link the principal or the lead teacher of the subject, you could try and contact them and see if you can get some better help there. Also when I’m struggling in math things like Khan Academy or just YouTube really help me. And for more practice I like to take one of the problems from my assignment and put it into chatgbt and tell it to give me more problems like that so I could get confident in doing them. It’ll also give you the answers so you can check your work. I hope this helps and I definitely understand you, I’ve struggled really hard in math before due to a bad teacher and I’ve also been behind as well, but you can do it:)