Find out your school's wireless Internet password by checking the Wi-Fi settings on a device that has connected to the network. It's also very likely that your student ID and password can allow you to access the network.
If you are using a Windows computer, right click the Wi-Fi symbol in the system tray on the bottom right, and click Open Network and Sharing Center. Click Change Adapter Settings on the left, right click the Wi-Fi adapter, and select Status from the context menu. Click Wireless Properties, navigate to the Security tab, and check the Show Characters box under Network Security Key. You can now see the password of the Wi-Fi network.
If you have a computer that has connected to the network in the past but is no longer connected to it, click the Start button, open All Programs, and then click Command Prompt under Accessories. Type "netsh wlan show profiles", and hit Enter. Find the password next to Key Content under Security Settings.
On Mac OS X, open Keychain Access from the Utilities folder under Application. Identify the network from the list, and double click. Type the username and the password of the administrator account, and click Allow. Reveal the Wi-Fi password by checking the Show Password box.
It's also possible that you do not need a separate password to connect to the network. Some schools allow students to connect to the Wi-Fi network using their student IDs and passwords. In such cases, the network automatically redirects you to the login page when you try to connect to a website.