Ditto what aeh said, plus one additional caveat, which will be dependent on your state. Our state's standardized testing is designed only to check to see if students have mastered the bare bones of the curriculum goals for the grade they are in, and it's also a relatively low number of questions of each type. Hence it is not a test that will separate out kids who are truly working ahead - for instance, in the schools my kids have been in (in elementary, and not gifted magnet schools), it wasn't unusual for 25% or more of the students to score in the "advanced" category, so in our state, it's really not a test that can be used if you're advocating for differentiated work for your child. It's more often used to flag children who need extra help because they aren't keeping pace with the curriculum.
This could be entirely different where you live - I'd try to read everything you can on the test, and also see if you can view test summaries by school online to get an idea of how many students score in each category.
Best wishes,
polarbear
