yep 1 year wait
From the RCMP website:
Question: When can I rewrite the RPAB?
You must wait at least a year between writings of the RPAB. The reason for this is that writing the RPAT test two times too close to each other leads to potentially invalid results. An adequate amount of time (i.e., 1 year) must go by to ensure valid results. You will be signing a security form indicating that you have not written the RPAB (nor the Telecom Operator Aptitude Test (TOAT)) in the last year. Writing the
RPAB early and signing this security form is viewed as indicative of an integrity problem, and will be pursued as such.