John Hopkin's Center for Talented Youth summer camps (aka nerd camp) have been offering the Spatial Test Battery as a qualification method since I was in middle school (~10 years ago). See http://cty.jhu.edu/ts/stb.html and for a sample subsection see http://cty.jhu.edu/ts/stbsampSD.html. I never took it (you could also take the SATs as well) but as a heavily technical person my brain does backflips of excitement solving the sample problems.