 The decision sparked some degree of controversy The NNAT-2 is considered significantly harder than the Bracken School Readiness Assessment (BSRA) which it replaced.In New York City, the NNAT-2 makes up 50% of the gifted and talented exam, the other 50% is the Otis–Lennon School Ability Test (OLSAT).The NNAT has been found by one study to show excessive score variability, with within-grade standard deviations reaching as high as 20 points.