Typically, using your own VPN should suffice. Depending on your situation you can do other things as well. If you are unable to download these tools on the school network in question; do not attempt to do so again. Use a public or other network connection elsewhere to obtain the tools you need to bypass their crap.
For example, NextDNS could be helpful. By running their client app; ( https://github.com/nextdns/nextdns/wiki/Windows ) you can make sure all your DNS requests are encrypted. Similarly you could simply set up a local DNS server that you point Windows at which can redirect those requests over DNS-Over-(HTTPS or TLS) to a DNS provider of your choosing.
This is why I use SearXNG; locally hosted on a container. It collates and sorts out the crap from all the engines at once. I get a useful list of results normally. My personal instance is configured to shotgun several engines at once and uses Wolfram Alpha or Wikipedia for informational boxes over other engines; if those services present a result.
My experience:
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