Where is box 8 on form 1098?

If it's a form 1098-T Tuition form, look at the bottom of the form for box 8 Checked if at least half-time student. 

• Per IRS: Check this box if the student was at least a half-time student during any academic period that began in 2020. A half-time student is a student enrolled for at least half the full-time academic workload for the course of study the student is pursuing. Your institution's standard for a half-time student work load must equal or exceed the standards established by the department of Education.

If it's a form 1098 Mortgage interest, also look at the bottom of the form.