School computers are riddled with spyware & proprietary software, the fact that they use windows is bad enough, but then you are forced to use edge or chrome and other proprietary software and often you are blocked from installing open source alternatives like librewolf or duck duck go may be blocked.
What I am asking is, how can we get around this, do i just need to bring my own laptop using FOSS privacy respecting software. or is there another way around this. Thanks for the help.
You don't.
Seprate your work life and your personal life.
There's nothing wrong with advocating for FOSS alternatives; but you don't get to decide what you can or cannot use on work devices, that's up to your employer. You should not be entering personal info/performing personal tasks on work devices.
If you're unwilling to perform work with the tools (software) your employer provides/requires, find a new job. Refusing to do the work or tampering with the equipment provided is a great way to get fired.
For school; personal laptop. Or again strictly school tasks on their devices.