I am tired of school…

Hi, i wanna talk about my school life.
As you can read from the title, it sucks. I am a student of a Technical School in Informatics department and we have a lot of exams in a month. I am redoing my first year because i failed a class. Even though im still i still learn the same topics as last year, i fail them. I already failed 4 classes by now and i need to get better. The thing is, i feel so stupid. I have no power anymore. I do give my best but the results never change. Please guys give me tips how to be better…