Responses
Maybe her rank went up when she is starting her second year. Being a president of the Babyls, maybe her rank went up by 2 and became six when starting her second year. Being chosen as the president of the student council has a merit and maybe it's the rank.
You have a point. I also thought about that (￣∇￣")
Wait if Iruma was the first one to reach rank 5 in first year, the what was Amelie's rank on her first year??? She was introduced as rank 6 but that was the start of her second year right?! Help!! (⊙…⊙ )