SAT Subject Test Question -- Taking Fewer Tests than I Originally Signed up For

Hello CC Community,

I signed up for two SAT Subject Tests this June (Chem and Math), and realized that chemistry is too hard. I saw on the College board Page that you can choose to take fewer tests than you originally signed up for. So how does that work? Are we given a checklist on that day for the tests we want to take? Thanks.

You take the one you want and then leave.