NEED HELP!!! QUICK QUESTION

Hi guys,

So for the SAT subject test, I signed up for Biology and Math

But coming to think about it, all I want to do is take Math tomorrow and take Biology in November!!

What do I do?? Do I not change anything to my registration and just do one test tomorrow despite registering for 2 tests? Is there a refund? Please help! Thank you

And also, I registered so that the scores of these tests would directly send to the colleges

So if I decide not to take Biology, what will happen?