Frustrated

Just finished my microbiology test yesterday..All also dunno how to do..T.T..Who will remember all the temperature and the time for the microbes to grow~~!!If there were thousand of microbes..Means I have to memorize all?Felt really frustrated with this semester..All subjects seem so hard to get good results..Why university's exams would be like this?It is all depend on the lecturers..What they like,they will put in the paper,even though not in the notes..So,what the use of studying the notes?..Useless and waste time..Study and not study have no different..University's life is really not as easy as what I think..Haiz..