Can I sign up for another SAT II on the same day later than the first SAT II?

I’m unsure whether I want to take SAT II Physics since I’d only be in the beginning of the course in November, even though I’m self-studying. If I do know that I want to take Math II, would I be able to sign up for just that, and then later, when I’ve decided, sign up for Physics on the same day and in the same place?

Could I potentially just stay in the test room and ask to take another exam? How would that work and how would I pay for it?

Also-- it’s slightly off-topic: tips on whether I can entirely self-study SAT II Physics by November of this year having never taken a physics class? I’m using PR and I plan to get other prep books as needed.

They give you a big book with all available tests on the day of. You can add, subtract, and switch out on test day. They will bill you later. Just check online to make sure the test you want to add is being offered on that date.

Thanks. I decided that I’m not going to be taking Physics until May.