I would think that FileVault is overkill for school homework. If you set up your Mac so that it doesn't automatically log in when you turn the power on, that would go a long way towards keeping someone from getting at your data.
Still, it's your choice as to whether to use FileVault or not.
Protect data on your Mac with FileVault - Apple Support
"WARNING: Don’t forget your recovery key. If you turn on FileVault and then forget your login password and can’t reset it, and you also forget your recovery key, you won’t be able to log in, and your files and settings will be lost forever."
I would also advise you to make backups of your Mac. It's never a good idea to have all of your data all in a single basket – and with recent Macs, if there is a hardware failure, there will be no possibility of "pulling the drive" from your dead notebook in order to recover data. The SSD is soldered in, and the contents of the SSD are encrypted with keys held in the Apple Silicon chip, whether you are using FileVault or not.