I am pretty sure that math score for grade 2-5 test can go beyond 260. My DD8 got over 270 in the beginning of the 4th grade. I know a kid who got over 280 at the end of 3rd grade and another who got 290 at the end of 4th grade. They all took grade 2-5 test. For our district, the high achievers can switch math test to 6th grade at the beginning of 5th grade but not before 5th grade.