On the admission page, it says that we can submit three sat subject test scores. If I plan to submit sat 1 test score, three AP exam test scores, do I really have to submit three test scores for the subject test? (What if I only have two sat subject scores?)
Read the admissions page again. You are required to admit one of the following—not all!
If you want to admit more than one of the following, you can send just 2 subject test scores as a supplement to another requirement.