Existing Uber users can get $25 off their next ride through 12/31/20 by using promo code: ISICSTUDENT. Go to Promotions in the app or online and enter promo code.
The offer is valid in the US only. Offer expires December 31, 2020 but I’m sure it will be pulled before then.
It’s possible that it will be removed so it would be best to add it to your account right away and also use it as quick as possible.