Pull your kids out of UNIVA and send them to public school like the rest of Mexico.
Private schools in Mexico are bullsh1t, I used to teach in them... they are over priced crap farms where the teachers really could care less. Half the time the teachers show up they check their messages for 30 minutes, write something on the board and take off for an early lunch. The kids are a bunch of spoiled sh1t bags and don't bother attending anyway, I guess they get it from their parents.
You could save 20k per month by getting your kids a library card.