@nellienel40
You question was answered in the earlier replies in this thread. You can still file amended returns for both 2017 and 2018.
You cannot claim a credit if you were or COULD BE claimed as a dependent by someone else.
The American Opportunity Credit, for your education, can be claimed for up to 4 tax years, including times claimed by anyone claiming you as a dependent.
One other item, not mentioned above:
There's a new urban myth among college students that says they can get a $1000 from the government just for filing a tax form. For most of them, they simply aren't eligible. A full time unmarried student, under age 24, is only eligible for the refundable portion of the American Opportunity Credit if he supports himself by working. You cannot be supporting yourself on parental support, 529 plans or student loans & grants. You usually must have actually paid tuition, not had it paid by scholarships & grants. It is usually best if the parent claims that credit.
