TurboTax actually calculates which deduction you are entitled to from your input in the 1098-T section of the interview.
I recommend going back through the interview section as follows and correcting your entries here.
- Go to the Federal section of the program
- Select "Deductions & Credits"
- Select "Expenses and Scholarships (Form 1098-T)" and click start
Once you update all of your information, TurboTax will determine which credit or deduction is the most advantageous for you.