You cannot use the AOTC for graduate school. That is a credit for only the first four years of undergraduate school---before achieving a bachelor's degree. A grad student can use the Lifetime Learning credit--which is non-refundable but which can reduce tax owed.
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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