Quick Vent

I tried so hard. You have no idea how stressful it is to know that one mistake can throw off your future. I made a mistake. I should have been more careful. Now I have a B.
A B! Of all things, a B! I needed an A this quarter, but because of being sick, now I have a B! I tried, and failed to keep up my grades, and now I have an 89, which will drop to an 82 today. I did the math. I'm screwed. I need all A's. 
I can't keep up with all this. Our school system is rigged for stress, and it definitely works on me.