You have "Pay enough attention in class?" Not in English, you don't.
Algebra I is ♥♥♥♥ regardless as long as you pay attention. If you had natural talent at math, but don't pay attention, B+ at maximum. Pay attention and even if you're a dumbshit you shouldn't fall beneath a 92.
Pay attention. Seriously. Take notes. Look at notes. Study.
That can help with acing the course. Most important of all, show and check all of your work. Showing your work is often like 50% of the grade IME, and checking it can avoid stupid mistakes like thinking a 4 is a 9.