I wonder if this is what happened to my granddaughter who was enrolled in a Catholic school in VA? Her math scores declined so precipitously after 2 years in Catholic school that my daughter pulled her out and sent her back to public school even though my daughter is the music teacher in the Catholic school (very awkward.) To catch up, my granddaughter has had to spend a full year in Mathnasium, a 2 x per week math tutoring program at $200 per month.
My granddaughter tolerates Mathnasium, but doesn’t really like it. The interesting thing is that her Mathnasium classes are full of Asian students who go there “for fun”, not because they are behind in any way.
My wife has already told our grandson that this summer he'll be learning his multiplication tables because there'll be no time to learn them next school year. Third grade math homework used to be to memorize those times tables but we're worried next year will be expanding upon topics already brought up in second grade - median, mode, and range, shapes and their vertices, comparing fractions, etc. We're pretty fortunate that our grandson is pretty good at Math and so most of this work is ok for him, but we're not taking any chances with next year. If third grade is anything like second, there will be no time to memorize times tables after school and still maintain his little kid-ness.