Another lurker here - my son, also 7, has also been diagnosed with sensory perception disorder. He has not been IQ tested but will this fall (2nd grade.) I am expecting it to have a huge effect on his testing, as it seemed to during regular first grade tests (leaving entire pages blank, getting bored/distracted and picking random answers, ignoring the questions completely and writing whatever he is thinking about at that time...) Do you still do OT? My son took a break and I am deciding if he should go back. I wish there was a way to improve his testing skills to reflect his real knowledge and abilities, but I am thinking that it is just how he operates and maybe he will "test better" when he is older.
Also - my older daughter goes to the gifted school here in our town and I've found I shouldn't talk about it at all unless with parents of other students who go there.