I proactively opted my kids out of these bullshit tests too; by never sending them to government schools in the first place. What a total waste of 12 (of the best) years of your life...
EDIT: Here's a link to some older costs: http://nces.ed.gov/programs/digest/d10/tables/dt10_063.asp
A little hyperbole! I went to school, and also have a job.
Here in Germany we have some private schools that are almost free because they are run by the catholic church or protestants. Other non religious private schools are at about 5000€ per year.