If you're in high school then you are either in the middle of exams or they are fast approaching. Most likely you are fairly stressed and anxious. Just remember, you are not defined by the score you get at the end of year 12. For the sake of your mental health, schedule in time to do things you love. Doing this will put you in a better frame of mind and the time that you do spend studying will be more productive. There are some ideas above if you're stuck.