do you often review your knowledge?

I sometimes do the same thing! Once I listen to my teacher or read something important from the book, I just leave it there and do nothing about it! It's pretty dangerous for me. I think the aim of learning is that we REVIEW the knowledge we got and PRACTICE it on real life. Sometimes I just think that knowledge is just something we need for passing the exams, for getting our degree. Should think more than that from now on.

Its good thing that you know that that is a bad habit cause you are already aware of the things that you need to improve on and about what you are going to do about it. In your case, i think you should study it out over again cause as you said you forget it every time.