The IQ test that measures intelligence, according to Eckhart Tolle, is an extremely narrow view of true intelligence. Tolle himself wasn't able to solve the little puzzles let alone take the whole test. He was too slow for that.
According to him, intelligence is a much vaster thing than just to accumulate knowledge or information to solve problems or little puzzles.
Real intelligence resides in alert stillness - in between thoughts - that's where the original intelligence lies. Anybody who is creative and there are not too many out there - has some access to it. Albert Einstein, for example, had it - who btw was considered slow and not intelligent at school. His teachers told his parents that he was not suitable for mathematics and physics (imagine that).
In other words, his thinking was very slow. Now what does that mean? It means, there were lots of spaces in between the thoughts. He wasn't one of the so called intelligent students at school whose hands would go immediately up saying, "I know! I know" when asked questions by the teachers. That's superficial intelligence and Einstein wasn't one of them.
Einstein was in fact one of those children, who are not recognized by our superficial society, who was very deeply intelligent.