Usyd discourage me a lot

I used to be very good at studying. I got many prizes and good grade in the past. But ever since I got into usyd I lost my confidence about myself. During the semester, I spent 7-8 hours a day studying but I didn’t get good grade. Then I said to myself that may be my method wasn’t effective, let’s try next semester. I kept encouraged myself every semester so that I will not give up. I tried to reflect to improve from the last semester plus I studied so hard. I dedicated all my time. In this semester, I was so confident after going out of my 4 exam rooms but the grade remains the same throughout. I got 75 ish which you guys can say it’s not bad but I have dedicated my time for studying but still not achieve what I aimed for. I studied every single thing. I also tried not to waste a single day studying for 4 months (and my last 5 semesters as well).

Now I am graduated, I don’t have any semester more to improve. And I start thinking that it’s all set and that my ability is set for that and I can’t do anything to improve. The high achieving is for people who are innately better (I don’t say that they are not working hard but I also worked hard. It’s just I am not qualified enough).