DIfficult question John.
If your state standards are anything like mine, there is no way to meaningfully cover the entire curriculum in the course of a year. The test is usually in March or early April which cuts one or two months off what is there. There is just not enough time. SO yes I think some of the work should be divided up if it fits into the curriculum. I do not think a teacher should chuck what they are doing to cover another curriculum.
We have spent the last two years Mapping our Reading Writing and Math. Because Math is so obnoxiously packed with standards that there is no way to cover it all we found ways for the writing teachers to fit some math into their curriculum, and the reading teachers are doing it also. This way everyone helps out.
State tests are a thorn in our sides and until someone can talk sense into the politicians (who have no educational background what-so-ever). Until then, I believe we all have to pull together.
Jst my two pennies worth.