The most important thing about your grade
Grading, assessment, and knowing[1]
The most important thing I care about is if you really understand this material. The most important thing you should care about is if you understand this material. I also care after you, our class social environment, and other stuff. However, what matters most to me if you understand computer science.
Understanding something isn't a yes/no or true/false. The best way to answer this question is to ask yourself to what extent do you understand this material.
I understand you worry about your grade. You should worry more about how well you understand our material.