Are you trying to setup Wifi with your new student account? If so, ensure you are doing the following:
1. Go to a computer in school and type in your new username and temporary password.
2. Create a new password.
3. On your phone, go to your wifi settings, press and hold the current network you are using and select "forget".
4. Logon to the network called "CR-GC-Wifi" using your new username and new password.
You should then connect to the the school network :)