The last time I tested for 4 licenses at the same time.
The exam proctor at REC Boston asked me what order I wanted to take the exams and modules in.
I asked to take Rules first ( they apply one Rules module to every license), and then all 4 deck generals next. He wouldn’t let me do that.
I had to complete one license exam before starting another. But he let me take the exams and modules in any order that I wanted.
I took Rules first, then for each exam the 70% modules, then chart plot, then terrestrial and celestial.
What the NMC exam rules are, and what they actually do at the RECs may vary somewhat. I think it might also depend on how busy they are. There were only three or four guys testing when I was there.