I am a 16-year-old finishing up high school. In the first weeks of April I took 3 exams, namely Math, Physics, and Chemistry. I took Math and Chemistry on the same day! And they're both 3 hour exams, with only a 5-10 minute break in between them! I racked my brain for about 6 hours straight. But it was worth it in the end. The way I get my final mark for these subjects in Alberta, Canada (that's where I live), is that 70% of my final mark comes from school, and 30% comes from the exam I take. My exam mark for Math was 90%, and my final mark is 92%. My exam mark for Chemistry was 87%, with my final mark being 91%. My exam mark at Physics was 94%, and it is the hardest subject! My final mark at Physics was 87%.
I tend to try harder at subjects that are harder and more challenging for me, as shown with the Physics above.
I had to delay my English exam, my teacher said I wasn't ready for it. I'll definitely study hard for that!