Test anxiety

eat a balanced meal, avoid sugar, avoid going a long time without eating, avoid high carb meals like pasta, take magnesium, drink lots of water(there are specific scientific reasons for doing these thing). you already know a good part of all this (whatever percentage you got right in the exam) so you just need to learn the rest. make a plan about how you will attack your studies. break it up into a step by step plan: from this time to this time I study this part, from this time to this time i study the next part etc. it releaves a lot of the stress to do that because then the question " what am I gonna do? (a stressful question)" turns into the affirmation "this is what I will do" . good luck