Hi there!
I can understand how school can be very difficult this year for all of us including me, here are some things that helped me!
1. Keep a routine.
Keep a schedule. Wake up in the morning, take a shower, eat some breakfast, head to class.
2. Have a desk.
Sitting in your bed all day may be comfy but is not going to make you very productive.
3. Turn some lights on.
Listen I love the dark and find it relaxing but all its going to do is make you sleepy. Try opening your blinds for some natural lighting.
4. Have a nice enviorment.
Nobody likes to be in a dirty area. Try to keep your room clean and maybe add some decorations! Plants add a nice natural touch!
I hope this helps! Good luck :)