How to Get More Than 15GB of Space on Google Drive

Are you a student? Students Can Get Unlimited Google Drive Storage for Free

If you’re using Google Apps for Work and would like unlimited storage (or 1 TB per user with 4 or fewer users), you can upgrade to Google Apps Unlimited. See also Options for adding Drive storage

Not everything in your Google Drive counts toward your storage limit, so don’t go around indiscriminately deleting files. Anything you create with Google Docs, Google Sheets, or Google Slides does not count toward your limit (neither does any Google Doc, Sheet, or Slide shared with you). Pretty much everything in Gmail counts, but only photos larger than 2048 by 2048 pixels and videos longer than 15 minutes in your Google+ Photos count toward your Drive storage limit.

You can open multiple Google accounts and use a client such as Insync and https://www.odrive.com/m/ to combine the storage allotment.