With my dd who is pretty consistent, even when she got inadequate or what amounted to no instruction, her reading MAPS scores went up while her math MAPS score kind of stagnated. I attributed it to her being able to pick up reading and most language arts by osmosis basically b/c she read a lot. Math, on the other hand, suffered a lot in the absence of actual instruction b/c it wasn't something she had the opportunity to self teach in the absence of reading math texts or being a seriously mathy kid who saw math in daily life, which she is not.
In your ds' instance, what have the percentiles and total #s looked like -- was it 99th consistently with the #s going up and then a slow decline?
Does anyone who knows much about MAPS know if the test is a different version starting in 2nd when the OP's dc' scores started to level or slip?
