"A large majority of middle school math teachers say the common core is more rigorous than their state's prior mathematics standards. At the same time, most teachers reported receiving fewer than 20 hours of professional development over the past year related to the common core, according to the new study."
"A new analysis of how all U.S. states stack up against countries around the world shows that 8th grade students in 36 states outperformed the international average in math and those in 47 did so in science."