Headphones with a microphone can be a life saver! They help you be heard clearly without having to shout.
Sit comfortably while keeping your posture right with an ergonomic chair. Bonus points- get an ergonomic chair with wheels so you can scoot around between your classes.
This simple posture correcting backrest is a cheaper alternative to the ergonomic chair. It will prevent you from slouching and sitting comfortably.
A Bluetooth mouse and keyboard can help reduce the clutter in your work area. Also, they can be packed away easily.
Sitting for long hours can be detrimental for your health. So, opt for a standing desk. These desks can be easily set up or stacked away when not in need allowing you to switch between standing and sitting any time you want.