How Do You Deal with Blocked Websites at Work or School? or Why Are Some Blocked Websites Still Acces

Wait, so VPNs aren’t foolproof? That’s kinda scary. My school’s IT department is pretty strict, and I don’t wanna get busted.

Does anyone know if free VPNs work the same way? I’ve been using TunnelBear, but idk if it’s enough to hide my stuff completely. Also, can they still see the sites I visit if they’re really determined?