Snowbunny3318, most of the kids who take high level courses at a young age are not doing it because they are obsessing over their grades. They’re doing it so they won’t be bored out of their minds. And, Mensa is a society, not a classification. You mean gifted.
Torah, it sounds like you’re working hard. But, it doesn’t sound as if you’ve pinpointed the actual problem. Is the style of teaching working for you? Size of class? atmosphere? Were you put into this class because you are gifted? Do you enjoy math? Basically, is your only problem the fast pace of the class or are there also other factors? It’s great that you did better on the quiz, but make sure nothing will interfere with it staying that way or getting even better.:)