SAC query

Hi all, I’m taking my first year 12 classes this year and trying to finalise my SAC dates for the calendar. I teach a subject where I am the only teacher so I take both classes. Should I be trying to schedule their SACs on the same day? Currently (due to camps/public holidays) one class will be ahead 1-2 lessons for the entire term. So if I try and keep them on the same day one class will miss out on revision time in class.

Thank you for any advice.