first, if you learn something new, you must review/ go over it in time and note down the problems that you are not good at. second, you must practise more. third, you must have a good plan about waht you're going to do and make the best use of time so that you can save much time to do something you're interested in. what's more, it can improve your grades.these are my successful experience. i wish it a bit helpful to you all.