学习退步用英语怎么说

my study is getting worse and worse.

fall behind in studies.

backslide/setback/lag behind etc.

I am not progressing in my studies. In fact, it's declining.
是有点smart ass的感觉啦。。

but that's what i am anyway..

或者就直接说 i suck! 开玩笑的啦