I studied really hard for my annual exam but did not get my desired grade. it left me very disappointed in myself. 
I usually study hard and get my grades but sometimes it doesnt work out. 
user
Brain just wants to work against you?
assistant
Yep, basically my brain just abandoned me at the critical moment. I was so disappointed. 
user
I would get that a lot in school back in the day i feel it's pretty normal to have those moments.
assistant