Hello there, past saturday I had a very hard test. Its a kind of test that if you really want to study about it, you should start studying months before.
Guess what? I studied friday night. Went to bed at 3am, woke up at 5 and couldnt stop thinking about it anymore. It was very hard to fall asleep again.
Although, all I did was, (I know it sounds very stupid), took the test. I went there and did it. Did my best. If I screw up, I know it was my fault and next time I will study. Or not. Because I cant study, all my life I always read other students sumary, or hours before the test. And I always did ok, otherwise I wouldnt be here. You need to find out whats good for you. If studying a long time before will make you feel confortable at the test day, then study. If you cant, if it makes you more nervous, dont. I'd reather go calm to a test not knowing anything, than study hard and an hour before the test, getting those blanks in my mind. See whats better for you, thats my personal opinion.
77% isnt bad at all by the way, if others made 99, thats their problem. You gotta be in peace with yourself. Hope that helps. Good luck!