So it sounds like the RTI route would take about three months into the new school year, but that they could be talked into the discrepancy route. Where you have current testing, that seems like the obvious next step. It also sounds like an IEP would not be contentious, though that still leaves the question of accommodations and services open.
W score differences of 1-15 show that some areas have seen negligible growth over the year (those pesky low single digit scores). For your reference, a ten point increase in W score means that a person's performance on tasks previously completed with 50% success has improved to 75% success. That is reasonable growth over the course of a year.
