SAT suggestion

I tried to sign up for the SAT subject World History test in June, except it was all full. Honestly, it's not that big of deal because I will take several subject tests next year and history is probably not going to be my highest score. Maybe for next year, if at all possible, there could somehow be priority for those students who are currently taking the subject (especially if they are in the AP version) and there could be more advertising for signups. Does this sound reasonable?