Mathematic may be difficult for some, but in reality it really is an easy subject.
It is obvious that you won’t understand mathematics if you don’t listen to your teacher and if you don’t take notes. If you don’t try to understand, you obviously won’t. You have too put your own effort if you want to acknowledge maths. If you just talk with your friends during math class, you won’t pay attention so it will lead to incomprehension.
I hope it helped I did my best.