I am certified Iowa Basic Test Administrator and that is what I will be doing with my kids. Missouri, were I live, does not require any testing, but for my own piece of mind I would like to, just to see if my kids are keeping up or ahead of the average. I am also a Stanford administrator too.
If you go here:
http://www.bjupress.com/services/testing/tests.html you can see if you qualify to be a test administrator or you can find people who are certified to be test administor to give the test for you. One of the things it ask on the applications if you want your name and phone number to be in a data base for others to contact you if they want you to test their children.