It is important that you forward emails and copy your files from Google Drive. Once your account is disabled, you will no longer be able to access them.
If you are leaving at the end of the school year, your account will be disabled in August so you have the whole summer to do this.
If you are leaving in the middle of the school year, your account will be disabled the day after you leave so you have to do this right away.
Access to school systems such as Wisdom, Gateway, Gmail, Google Drive, etc, will be deactivated after you leave WIS.
Access to software such as Microsoft Office 365, Adobe Creative Cloud, Canva, etc, will be deactivated after you leave WIS.
Access to school Gmail will be suspended after you leave WIS. Make sure that create a personal email account and use that for registration to online platforms (eg. twitter, facebook, Instagram, etc)
https://support.google.com/accounts/answer/6386856?sjid=16882322322135648557-AP