My layperson thought would to choose the stuff you know he will do well on and present that first. That should build some confidence and even if it doesn't at least it should be unaffected by the meltdown you might see with the harder stuff. I have one kiddo that will just shutdown when presented with harder stuff and that is how I would probably do it with him.
My other thought is, you can obtain these tests (e.g. Terra nova and Iowa tests) and self administer (assuming you have a Bachelor's degree). I did this last fall with three of my kids and it afforded me the opportunity to see how they test and also the opportunity to intervene and "talk them off the ledge" when they hit harder material. I found this more valuable than the actual scores.
