I feel like the world is ending

i just got a 73 on a advanced functions unit test and i just feel so bad. i had a 100 on the first unit test and i studied SO hard for this one, i did all of the homework and the practice tests. there was two application questions that were so unfair, half the class got those two wrong and i also got communication marks off because i used my last semester teacher's notation not my current teacher. also i had a bad day on the day of the test and i talked to my math teacher but she said i still had to do it. and there's no re dos for our class. i was aiming for 100 final average this year but that's impossible now and i feel like i should drop the course and just give up on university