Every year I take the IQ test, it goes up ten points. The IQ test is crap. Predicting someone's future on a crappy skewed test is garbage. If the test is crap, it would not predict income or intellectual success very well.
There are other things besides genetics that determine IQ, but genetics are at least 50% of it.
Your score keeps going up because you are becoming more and more familiar with the test and the types of questions it asks. Retaking a test tends to bias the score upwards, as anyone familiar with inteligence testing statistics knows.
If someone can improve their score, then what does that say about the test??? It's just a TEST. I care more about production and results. Either way, this thread is supposed to be about immigration, which is even misleading since if the government did their job with illegals, we'd not have this discussion.