Hey there!
1. You could feel joy and anguish at the same time, like when your happy crying. For instance, if one of your elderly great grandparents dies in their sleep suddenly, you may feel very sad, but in a way happy that they lived a good long life. You may also feel joy because they died peacefully, without pain.
2. I think the biggest factor for getting good grades at school would be turning in your assignments. As long as you take your time and turn your assignments in on time, your grades should stay high.
3. Here are two words that relate to the word "com" : Complement , Complaint. These to words do, in a way relate to the word Commentary, because as well as a Comment, they are both forms of speech.
5. (Example) I think if I could change any restraint I would change the fact that we don't have the privilege of using our own devices at school. I happen to have a iPad I take notes on with an Apple pencil. While taking notes with paper and pencil is classic... taking notes with an iPad is way easier to means. My hands would break in class. I think it would be awesome if they could change that rule. While paper notes may get lost, notes saved on an iPad wont at all.
Hope this helps you out! Good luck!