Copy content from your school Google account to your personal account. 

Another option for transferring files:

• Create a new folder.

• Move all files to that folder. (CTL + A selects all files, drag & drop)

• Share that folder with their personal Google account. (limited storage)

• Login to personal Google account>click Shared with me> right-click folder>click Add to My Drive to ensure access to those files in the future.