I think there were a lot of reasons they gave those assessments and they were not "trying" to accelerate him--quite the opposite. The only reason the principal gave him assessments or met with us about it is because I pointed out the district has an acceleration policy and he/the school weren't following it. The principal told another family whose DD is even more advanced in math that their child was "too old" to accelerate (she's in third grade!) and it was unsafe for her to walk down the hallway to another class. Obviously excuses, but it shows how opposed he is to the concept. He was going to do his best to make sure it didn't work out for us/DS.
They also made him do all of the assessments in one sitting, so about 10 pages of written work all at once. Never mind the fact that he has an IEP for handwriting among other things and was 6 years old. Considering how hostile they were I didn't even want to push it. I took him out of the school and transferred him and he luckily got a fabulous teacher who is giving him much harder work than anything that he would have gotten being accelerated. Not sure if I will pursue it again in the future. As long as he has a teacher who gives him the right level work and he continues to learn, I don't really care.
Thanks for the info on the WJ grade norms. They put DS at 4th-5th grade for math (5th for calculation and 4th for applied math) and I knew that wouldn't be appropriate. I was just aiming for second.