Do I still answer 'Yes' to the full time student question? In Fall 2017, I was a full-time student (12 hrs) but the semester was not a full 5 months (late Aug to mid-Dec)

[SherekaB · Accepted solution]

Yes, that's 5 months because you were a full-time student at least part of each of 5 calendar months. 

Full-time student. You are a full-time student if, during some part of each of 5 calendar months (not necessarily consecutive) during the calendar year.

https://www.irs.gov/pub/irs-pdf/p970.pdf