I'm not sure 'control' is a good description of Common Core, although some southern states complained about tightening up their standards.  One of the factors contributing to student failure is the difference in curriculum from state to state, district to district.  A student moving from one district to another risks missing whole concepts; a lot of time is lost just matching up with curriculum.  I've taught Middle School Math for roughly 30 years, and  seen it happen repeatedly.  Once continuity is interrupted it's hard to catch up.   

Common Core Curriculum is meant to provide some continuity.  Districts have the autonomy to decide how they comply, but are held accountable to the standard.  The Math texts are rigorous, introducing algebraic concepts as early as first grade, and students enjoy the challenge.