Which shelf exam pairings make the most sense?

Hi everyone!

I will be taking my shelf exams in pairs, and I would like to schedule them in a way that makes the most sense. For these 6 specialties, which pairings work best? In other words, which specialties are the most similar to each other or will be the most efficient to prepare for when scheduled together? So far, the following are some example pairings I am considering. Thanks so much everyone!