How can I avoid proprietary software on school & company computers?

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.