You cannot get the American Opportunity Tax Credit if you are a grad student, but you might get the Lifetime Learning Credit. However, the LLC is NON-refundable. It can only be used to reduce your tax liability. If you do not have a tax liability, the credit does not do anything for you.
LIFETIME LEARNING CREDIT
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-credits-deductions/expenses-qualify-...
https://ttlc.intuit.com/community/credits-and-deductions/help/what-expenses-qualify-for-the-lifetime...
https://ttlc.intuit.com/questions/3262984-who-is-eligible-for-the-lifetime-learning-credit
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