Try these options to fix the issue you are having:
For Turbotax Online
If you are using TurboTax Desktop
If you are still having issues after trying these options, contact Customer Support by clicking the link below
You may have to delete the student and start over. Go through the entire education interview until you reach a screen titled "Your Education Expenses Summary". Click delete next to the student's name. You'll then get the "Your Education Expenses Summary" screen again. Click the "Add a student" button.
Your student must have been previously entered as your dependent, in the personal info section.