If you are trying to bypass a website blocked (Go Gaurdian, etc), try using a proxy. But other than that, I would not recommend getting a VPN. I've heard people getting suspended for doing that. If they can see what you are doing, do not install anything. It has gotten me suspended before too. It's not good at all. But if you want to take the risk, use Nord Express, that's the one I used. Also, try using Google Extensions, they help too.
Routing rules may be banned, you can try to use VPS set up DNS tunnel to avoid the network school rules Recommend the use of iodine, is the speed of the best Set up after the need to use shadowsocks software connect the DNS tunnels