Better MCAS

In talking with a friend about teaching all children well, I loved her suggestion for a better MCAS. She believes that there should be a 3-5 and 6-8 test prior to high school. Every year all students take the 3-5 test until they pass it, and then they move on to the 6-8 test. The test could include math, ELA and a social studies/science section and last over three days total, no more. Teachers would use the results to inform teaching the following year. I think this is an efficient, targeted, less costly, and much better way to utilize MCAS in Massachusetts. Do you agree?