So mad

and so SICK of school. I work hard, put a lot of thought into my homework, and study for hoooooooours. Then I go take a comp. I correctly identified my patient. I shielded my patient. I had the IR's in the correct positions. I put my patient's wrist/hand/fingers in the correct positions and made sure the arm made a 90 degree angle. I covered the other half of the IR. I used my markers. I collimated correctly, for the most part. On one of the "exams", the collimation should have been restricted a little more, and I accidentaly chose the wrong size IR.

So I did two things wrong. What did my instructor grade me?

72.72%.
AN F.

I've already been sick of school. It makes it worse when I apply myself like I'm supposed to and get crapped on for it.