Personally I quit doing B/A school after my first year because it was too hard to balance/emtertain the older crowd with young babies/toddlers around.
The older ones would want to play memory or do a complex puzzle but the little ones would get in the way. The older ones also wanted a lot of my attention and wanted me to interact with them, tell me stuff or want me to join in whatever they were doing.

I think it is best to either stick to doing babies/toddlers or else cater to before/after school. Mixing the two was very hard.

I also agree with everyone who said that school age kids eat waaaay more and are often less profit margin. My little crowd already has hearty appetites but they were no match for the afterschool crowd who can seemingly eat you out of house and home. LOL It is almost as though you were feeding them the amount they would eat for dinner except it was only early afternoon.

I think someday I might switch to doing just B/A school but I wouldn't mix the two again