Third+Grade

Please type what you see are the biggest changes your grade level will need to make, in order to address the Common Core standards.
We are concerned about having to purchase new textbooks. Second grade having harder concepts to master... Will there be an end of the year test to evaluate mastery of skills to move on third grade. What is the level of mastery for each student? What happens to students who master language, but not math. Do they get retained or moved on? Half day kindergarten will hinder student's ability to learn all the content needed to move on to first grade. Fractions are more depth... do our current textbooks support this?