Most importantly it ends AYP (adequate yearly progress) which was a nightmare of bureaucracy that created hostile environments in schools and brought punitive measures down on those schools that needed the most help. ECA also changes the amount of testing needed to get federal aid. All-in-all, it looks like a step in the right direction.
This doesn't mean that public schools will be perfect, but this at least unties a lot of the knots that the federal government had put into the system. There are still a number of knots that Michigan has put there that also need to be untied, but this is the first education bill passed in over a decade that hasn't felt like it was putting a vice on my chest.