If you want to know reading scores, the NAEP, the National Assessment of Educational Progress, tests students every year in reading and math to see how far they have come from previous years, and to determine how students are generally progressing.
The most recent available are shocking. It is simply startling how low some states performed on the reading portions of the tests. Massachusetts came in first place, with 47 percent of its students scoring "proficient" or above on the reading portion.
Below is a slideshow of the lowest performing states for the 4th grade reading test portion of 2009.
You can check out how the other states ranked, as well as other information like school funding and demographics here.