Supporting the teaching of reading

I am a first grade teacher and I feel like I spend my entire day teaching reading! In my district, primary students 1.5 hours in a 'core' reading class (using SFA materials), then an additional hour in a supplemental reading class (using SRA materials). We used to use the DRA to determine reading level, but now we soley rely on a students MAP scores to determine their reading level. Here is my problem with this: before my students took the MAP test this fall I spent the days before explaining the test to them, encouraging them to do their best, and showed them a tutorial online of what the test would look like, how to listen to the question again, and clicking on only one answer. But I find that my students do not give their full attention to the test and it is reflected in low test scores. These scores are used to determine the level reading class they will be placed in, and it is ususally a class that is too low for their reading ability, and they become bored.