i agree with you you just need to be relaxed while you study and also be relaxed at the time you give your exams so you will suceed 100 %
for examble i has a friend on school that make private lessons every day and he was also studing double time that i studied
and i also dont maked private lessons and when the exams come he was so nervous and he dont passed to any university and i passed
So its just 1 thing take it easy and dont be nervous :)