We should relax youself before exams,because the more neverous you get,the worse you will be。Here,I give you some advices,such as you can listening some light musics after class,which make you feel well。
Besides,you can do sports after school,playing basketball or playing football with your friends can make you stronger and good for your health as well。
Well,taking a walk after dinner with some of your friends is a good way,for you can talk about your study as well as other things during it。
Perhaps they can help you with your difficulties。In a word,just take it easy!。