The fact, that you can train for IQ tests should be obvious to anyone, who has ever done their homework.
I remember fucking first class. I had a homework for engligh language, and I had to pair words with translations.
Here is the problem. It was an N to N connection. And the two groups were different sized. And I remember being completely destroyed from it until my dad told me to just connect them the other way around.
How does that connect? Because you learn verry quickly to slow down and start metagaming. And here comes an actual experience from an IQ test. I was told a string of letters, and told to reverse them. So, I aced 4 letters, 5,6,7,8... And I could see the shrink start smiling. She was sooo waiting for this. This was special.
So, she asked me, how did I visualize and re-group the letters in my head? (Obviously some description from a past genius) And I told her, that I did no such thing. I just remembered them linearly, and without doing any change, I repeated the entire string, and said outloud only the last letter.
Her smile disappeared completely.