Stupid Cass

I got a credit for business and distinction for CTS in midterm. I was shock and surprised at the same time and happy of course. I've told my friends about it and their replies make me feel so insecure, and i began thinking and recalling, how did i get this kinda results?
This is so not me. I don't get credits! I don't get distinction! I only get pass! How did i managed to get such a good results? HOW? Still wondering. and the results i got have interfered me. I hesitated to study, i scare. So, today, i screwed up for all my quizzes =.=, okay, say am stupid. I still want a credit or distinction for finals. Notice i didn't mentioned abt my econs? LOL. because that didn't interfered me.