Trying to file my T4A, it says the amount to enter into box 105 but there is multiple 105 boxes. I'm wondering which 105 box to use? I'm a full time student in college

Canada?  You are posting on the USA forum.

If you were a student in the tax year, you will receive a T2202 tuition slip (you can obtain a copy from your college account). Boxes 21 will specify if you were a part-time student and Box 22 will specify if you were a full-time student. 

I hope this was helpful