Just get off TSR after this and revise as hard as you can in the time left, then try your best in the exam. We dont know how clever you might be, how much work youve done so far, how much work you will do in the time left, how well you will do in the exam. It's not ideal, but if you wnat the better results, then you just need focus and try your best.
Leave the worying and fretting till after the exam. You can make a positive difference now, so get on with it.