I can't think of anything I do differently in a B game (but I have 8th grade boys A&B tonight so if I notice anything I'll post it). As others have said, the skill level dictates a lot. I recently had an 8th grade girls B team that could have taken the JV girls I called the night before.
In the district where I call JH games, all A team games are, as one coach put it, "normal basketball". Games between B teams are 10 minute running clock quarters (except last 2 minutes of each half) for 7th graders and 6 minute quarters for 8th grade (normal clock stoppage).
BTW, just to pick a little nit. You can't have "5 quarters" in a game that does not involve OT...you can have 5 periods.
