Answer
June 1, 2019
The full-time student requirement only applies if someone is trying to claim you as a dependent. If you are filing without being claimed as dependent, you can claim education tax breaks even if you only took a very small course load. See the explanation of an eligible student for the two tax breaks you can claim in graduate school.
From IRS Publication 970:
Who Is an Eligible Student? (Lifetime Learning Credit)
For purposes of the lifetime learning credit, an eligible student is a student who is enrolled in one or more courses at an eligible educational institution (as defined under Qualified Education Expenses , earlier).
Who Is an Eligible Student? (Tuition and Fees Deduction)For purposes of the tuition and fees deduction, an eligible student is a student who is enrolled in one or more courses at an eligible educational institution (as defined under Qualified Education Expenses , earlier).