Well, the problem is that the Ravens is so old that it predates many of the test security measures that have been put in place in decades since. There are lots of copies of it already floating around the interweb. The test of choice for nonverbal screening these days is the NNAT. I happened to sit at Jack Naglieri's (the first 'N') breakfast table once, and heard at great length about the racial disproportionality cases he's testified for regarding exactly this topic of under representation of minorities in GT. There is still honest discussion about whether his test is the best way of approaching equity in GT identification (for example, Dr. Lohman, author of the CogAT, claims his test is better), but it's certainly better than teacher nomination.
