What\'s the hardest thing you\'ve done when you were still in school?

The hardest thing by far when I was in school was having to stay at school until 10 pm everyday even after regular classes were finished at 5 pm. It was called a self study period, but it was actually compulsory study period which would have put me in trouble if I hadn\'t joined it unless you have a real good reason that you can\'t participate. It was so stressful that it has somewhat diluted all the good memories in high school.

Hi [이름]! Thank you for making an effort in answering your homework for today. I feel sorry for you since you since you had to stay at school until 10 pm. Well I think all your hard work paid off anyways. You did an awesome job! Please read all the corrections I wrote down below and analyze them. I know you can do it :) See you soon!