I have revised my last reply. The whole box 5 amount is probably taxable.
Even so, your situation is still unclear. You may need to go to a tax pro.
What's not clear is what is this program that pays your tuition and how is it related to employer and the usual employer educational assistance plans? How do you get additional scholarships if your tuition is already covered by another program. Scholarships for room and board and personal are usually taxable (unless you use some of the money for qualified expenses, like books and a computer). What is your student/employee situation ( you mention "student teaching").
