My DS9 has said, "they never showed me how I did" for IOWA, Achievement and IQ. He never really pushed to find out more. I thought I would not say anything and just see if there is a reason to tell him.
It amazes me that he didn't react to the fact he was taking a test for 8th Graders. I felt like I had to tell him ahead of time because otherwise he might think he was in the wrong place. Once I say his lack of reaction, I knew he was not concerned. He's a little fearless in someways. That reminds me of his Dad.
Did your kids react to the idea of taking a 8th Grade test?