I've not heard of it being done just for CogAT, but your curriculum sounds like where my kids regular school curriculum is normally - K is basic addition/subtraction/comparison, 1st is double-digit addition/subtraction and introduction of multiplication. 2nd is lots and lots of math word problems on addition/subtraction/comparison, multi-digit addition/subtraction and multiplication/division and intro to fractions. 3rd is multi-digit multiplcation/division and more fractions and lots and lots and lots of word problems.
This was all done to get the kids ready to pass the STAR test in 3rd which includes division and fractions and apparently a boat load of word problems.
