Should I change my registration?

Hi. I am registered to take the SAT on May 2, but I feel that I should change my registration to another date. Here’s the problem: I really want the QAS for the May SAT for practice, but if I change my registration, I won’t get it. Should I keep my registration for May and sign up separately for another date, or should I change my registration? Will colleges see that I registered for the SAT but didn’t take it if I leave the registration?