No need to create a new account with a different email! This would actually duplicate your account and create more trouble both for you and your School Admins.
Instead, all you have to do to update a new email is:
Click on Profile in the top right corner, and click on Edit Profile
Click the Basics category
Enter the email of your choice in the Email field
Click on the Save button at the bottom of the page.
Please note: Admins have the ability to determine which fields are read-only or editable. If you find that you can't change your log-in/profile email, please contact your primary contact.
Please contact firstname.lastname@example.org with any questions.