A student is defined as someone who was full time for at least part of 5 months. So, if you were only a student for three months, then you would not be defined as a student. This means you would be eligible to take the retirement savings contribution credit. Please note that if you are having trouble with this section, you may have told TurboTax in the Personal Info section that you were a student.
Form 8880 - Retirement Savings Credit
You were a student if during any part of 5 calendar months of
2016 you [and thus not eligible for the credit]:
• Were enrolled as a full-time student at a school, or
• Took a full-time, on-farm training course given by a school or a
state, county, or local government agency.
https://www.irs.gov/pub/irs-pdf/f8880.pdf