differential calculus

today, I took a diffrential calculus class.

It's very very difficult.

I can't understand what teacher explain.

at the first time of the class, I decided to study diffrential calculus hard, but I didn't keep it.

I should have studied hard.

but I think it's not too late now.

I can do it!!

I will study dffrential calculs hard from now, so I will be improved more!!