Why is it so ?

So I find myself asking myself why is it so when I try to do everything "right" by studying hard and getting good marks more and more just keep coming back and biting me in the a**? I mean I havent gotten the chance to go to sleep before 1 o´clock in the night for the last few weeks because I do everything the teachers ask us to do and when I go to school everything just manages to get messed up. But on the other hand another person who does not do anything until the last moment and bearly somehow gets the same result and maybe even a better one than me. Something is not right....