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IQ scores for blacks have increased over the decades, but unfortunately for your theory the scores for white, blacks and Jews have increased at about the same rate.

So the differentials between the groups have remained pretty nearly constant.

Meant to say “whites, Asians and Jews.”

It isn't my theory it is what they have done to the tests.

Today's test doesn't measure the same way as the IQ tests of twenty years ago. When I took the SAT tests, there was a direct correlation to that score and IQ. Because of the “gap”, they changed both the SAT/ACT tests and many of the more common IQ tests. And even with that, the test scores have been dropping (see this nice wiki article. Picked because it is a bit more neutral http://en.wikipedia.org/wiki/SAT#Correlations_with_IQ

I don't know where you seen that scores have been increasing. Much of the literature says the opposite. Of course part of the issue is who is getting the IQ tests, and why. Many states have moved their school testing away from anything that can be labeled “IQ” for the simple reason that they don't want to be sued for being biased. Again, ask any teacher.

IQ testing is a rather interesting study. For instance, there is no set model of what “IQ” means. Also, the base line keep shifting. By the old definition, a 100 IQ should be the mean. But few parents want their child to just be “average” so there has been a lot of pressure to inflate scores.

The IQ difference between races (and more dramatically) social classes have been the 600 lb bear in the room for some time. If you ask any teacher in a large district, they will tell you the same. A lot of it is home life, some is genetic. This doesn't mean that any individual is stupid because of who their ancestors were or what their home life is like, any more than athletic ability can be tracked that way. But if a student has a bad home life in a culture that actively attacks intelligence (which many inner city blacks and rural whites have), then it is no surprise that the test scores drop. In those areas, being perceived as "smart" is a fast tract to at least a beating, and in some cases worse.