Answer:
Pay attention and take notes. You will have to do all your studies even if you don't particularly enjoy the subjects. Most importantly, ask your teachers if there is anything that you don't understand. Later, more difficult concepts will be based on the simple things that you learn early on.
If you are not one of the lucky kids who can memorize at will, you will have to take the time and seriously study. If you are one of the lucky kids, your parents and teachers can help you find ways to keep school from being boring and dull.