Taxpayers' dependent is a graduate student. 

They never claimed AOTC for his bachelors degree (first 4 years). 

Is it possible for me to amend the last 3 years claiming the AOTC even though it was his masters/doctorate. 

dependent has no income and lives with his mom and he/she has never claimed his 1098t before. 

The 1098t is marked as a graduate student for 2020-2023. Tuition being over $50K. Or is it only lifetime learning and they missed out. (I was not the previous preparer).  

Thank you