If you’d like a quick glance at what apps and data are eating up all of your storage, the easiest way is to fire up

Settings –> General –> Storage & iCloud usage

There you will see a list of every app on your device – the apps taking up the most room are at the top.

PHOTOS

Deleting a picture or video in Photos DOES NOT actually delete the file for 30 days. Go to the “Deleted Items” album to actually delete the files.

MAIL

If you have not deleted/cleaned out your email inbox in ages, then it is very likely you have a ton of attachments you no longer need. You have 2 options:

1. Go through and manually delete messages
2. Delete the account in Settings –> Mail, and then set it back up again. [Remember that your school email is a google account.]

GOOGLE APPS [Drive, Sheets, Docs, Slides]

Sometimes the Google apps will keep a “local” copy of a file, and these can add up.  Fire up the Google Drive app, click on the “hamburger menu” at the top left, then select “Offline”. That will list any files that are taking up room on your device.

One each document,click the triple-dot menu on the bottom right, and see if the “Available Offline” slider is on, towards the bottom of the list. It should be OFF.