Factory reset iPhone
How can you factory reset a iPhone without itunes on a school Chromebook?
iPhone SE
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You don't, sorry (not on a Chromebook).
See this support article:--> Restore your iPhone, iPad, or iPod to factory settings – Apple Support
If you don't have a PC or a Mac, borrow one from friends/neighbors, or ask for help at an Apple Store or Authorized Service Provider.
or
You can try this procedure to restart from scratch:--> What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support
Regards
Giulio