If I completed my bachelor's degree in 3 academic years (2013-16) could I have claimed the American Opportunity Credit for 2018 during my first year of grad school? I'm confused if I had completed four years of post secondary education or not as the definition is vague on the IRS site. The AOC was claimed for me in 2014, 2015, and 2016, so if I have one more year of eligibility I would like to amend my 2018 return to claim it as that would significantly increase my refund.
