At school

search for drive in the start menu (if nothing comes up, follow the "at home" directions to download drive to the computer)
click Google Drive
follow the instructions to log in using your apps4pps account
open the file explorer and notice that your Google Drive folder is available

Get in the habit of looking in the Google Drive folder to make sure your files have uploaded before logging off your computer at the end of the period.

At home

download Google Drive at https://www.google.com/drive/download/
install the file
follow the instructions above (use either your apps4pps or a personal* email)

* if you prefer to use a personal email at home and apps4pps at school, you can share to your home email address any folders you need, then at home in the online version of Google Drive look in "shared with me" and add them to your drive