BCT makes a big difference - for children working below grade level and kids testing in the top 1%. Kids and parents who have been through our program back this up. 

We're building hard data to back this up - before/after standardized tests.

Right now, we only have a single data point - one boy who was below grade level (fourth grade, third month), used BCT for six weeks, and climbed nearly a whole grade (fifth grade, first month). We believe this is typical progress for our kids.