If going to grad school, that indicates to me that you have already completed 4 years of college as an undergraduate. It also calls into question what you age will be on Dec 31 of 2020. Age matters here. When it comes to things like dependency it matters if you will be under the age of 24 or not, on Dec 31, 2020.
For tax credits, what credits you may or may not qualify for depends on what credits were taken by either you or your parents while you were an undergraduate, and for how many years they took those credits. For example, the American Opportunity Credit (AOC) at a maximum of $2,500 is limited to 4 calendar years. I also think (but not sure) it's only available for the undergraduate years. Whereas the Lifetime Learning Credit (LLC) is a max of $2000 and has no limit on how many times it can be taken, if the student qualifies.
