Junior Year !!

Hi,

I am in junior year and it’s really stressful! All of sudden I don’t know I lost my self esteem which really really hurt my grades. Last year I used to get As in math for example and now I get B and Cs. Did you guys go through this at all idk , if you have any tipes please say them. Also I know there are lot worse things going on in the world then my grades but I want to be able to change those worse things to good things!!