One of the best "tools" I have used for Common Core is more of a concept, backwards planning. I look at the standard decide what I want my end product to be (what the kids will be able to do when "they've learned") and design that piece first. Then I design my unit around my assessment. I always begin with a pretest too so I can measure growth and extend learning when necessary. My partner and I spent this summer creating several more CCSS units using this model. It's a little more work up front, but then you just roll!