I have several apps that won't connect even though I connected to WiFi google chrome and browser work find it other apps that say can't connect to server or needs internet connection. When I'm at home it works fine
It really depends on which apps you are talking about. Your school may be blocking certain ports. Check with the app dev to see which ports they use. This may be available through an FAQ on their site (which may include additional hints). Your school may also have some type of content filtering solution in place. At my institution, our content filtering service is often blocking perfectly legitimate content. Lastly, check with your school's network administrator. If it's appropriate content, they'll probably be willing to help open it up for you.
I'm in college and in my case there are a proxy, this is common, and it's sometimes a good thingm becouse protects the people behind, in this case you may need to contact yout network admin and ask how to acces the network properly. If the proxy has no authentication it's just a little setup, but if not, you may need to use some app to get authentificated, if this is the case you can try ProxyDroid (it need root access) from here or PlayStore, or ProxyAuth from here on PlayStore. Sorry if this is not the problem, but it was in my case.