Does your school offer a filtered Wi-Fi access to students and unrestricted to staff? If so, you can try to retrieve the Wi-Fi credentials if the computers are always left on.
Using the Administrator account on the computer that is left logged in, verify that you are still connected to the SSID (The Wi-Fi name) of the unrestricted network. When you see that it is still connected, right click on the Wi-Fi strength on your Windows taskbar.
Of the two options listed in the menu, please choose the Open and Network and Sharing Center. You should see the SSID (The Wi-Fi name) listed if your signal has not dropped out.
Next, click on the SSID (The Wi-Fi name) to get to the Wi-Fi Status window to open and then choose Wireless Properties. On the right tab called Security, you will see the SSID (The Wi-Fi name) and the option to show the password’s characters. Using your paper and pencil, quickly copy down the information or copy and paste it in Microsoft Notepad and email it to yourself from the browser.
All you have to do know it add the SSID (The Wi-Fi name) and password retrieved to your device to use that network. Keep in mind, the IT Department may change the information each semester or each year along with the SSID (The Wi-Fi name) as well.