I'm going crazy

I don't know if I'm going crazy but I feel like I'm getting dumber and dumber every day. Its a horrible feeling, before COVID I was an excellent student I didn't need to worry about grades or studying because it was a second nature to me but since the year after COVID I'm feeling like I'm falling apart, like I'm getting dumber and more stupid each second.

The first subject I failed was before COVID and I had instances where I failed 4 subjects.

I know I'm in college and college level stuff is hard and harder if you have to also work and take care of your poor mental health but still.