Why do i must through all this exams school?

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one week ago my exam was begin, and i had a hard time to study and through that exams, the exams was contain all subject which some of the exams is difficult to answer it and many teacher in my school force indirectly to the students to get score 75% and it was very stress Now i feel sick and very sick that i forgot to eat just because this exam and it still 2 more days till the exam finish Sometime i think if all the exams is fair to me for my future or it just useless thing but school must keep it for the common subject for the students am i around here feel like this? does anyone can give me suggestion?