academics validation

I just received my trials result for the biggest exam in my life. I was truly baffled and disappointed of how it turned out. Im not expecting to pass with straight a's but i do have my goal which to get 7A's out of 9 subjects i took. But it was far way worse than i expected. Im just so tired of trying, i worked so hard for it. I have to deal with my struggles and mental health alone during the exam season and honestly im almost losing it. Its just sad because i worked so hard for so long just to get such shitty results. When i think back, good results is all i have to achieve to make my parents proud. They sacrificed a lot to provide me with things i needed. I really am trying so hard and my only reason im still fighting is because of my parents. I cant just stop and give up when my parents gave their all for the family. I dont deserve them at all. Im just tired man. Im barely holding on with life and academics, and i dont know what else i should sacrifice to get good results. I slept 2 hours everyday and study approx 20 hours a day just to pass my exam. Why is it so hard to get good grades? Why others can but not me ? Ive bottled up my feelings for so long cus ik all of my friends are struggling too. I never vent to people cus i know they dont deserve to listen to my problem. I thought i should solve my own problem. I tried, but nothing happen. My life went downhill. Im suffering with stress and tension from studies and school.