As long as you put in the effort, you should do fine. Do your homework, and if you're struggling on your openers, do the practice openers before school (or snack). They are almost the same as the ones you will take at the beginning of class, so you should have no problem. Mr. Brose is a great teacher that makes things easy to understand, so don't worry too much as this class (in my opinion) is designed for you to succeed.

Go in early if possible to study the practice openers always. Do your homework in class and ask for help especially early on because the concepts repeat.

Exams are worth quite a bit (in the 100s, with the second semester final being 4 days long and 1000 points). Openers are also a significant part of your grade, but if you do practice openers and the HW, you'll be fine. Math III Plus (this class, taught by Brose) is MUCH easier than Math II Plus, so if you're paranoid about taking this class, don't be. Most Tests are no calculator, but you don't need it.