@dmgallardo29
You are eligible to claim the AOTC for 2020, if you were half time or more for at least one term. That assumes that neither you, nor your parents, had already claimed the AOTC (or predecessor "Hope Credit") 4 times in the past.
If it was not claimed in the past, you may still be able to amend 2018 and 2019 tax returns to claim it now. It is too late to amend 2017.
