Hi j031p
The important thing is what you're good at, to use it and to develop your weaknesses. Everybody has different strengths in different intelligences, like those you listed - verbal, spatial, etc. I would also guess and say there are an infinite number of ways of dividing intelligence into areas.
Your heading mentions IQ - this is a rather outdated, but still used, method of measuring intelligence. IQ tests mainly test the logical and language intelligences. Howard Gardner has divided intelligences into 8 areas, others are being discovered, and no doubt more will be found in the future. Your question of what area does intelligence increase - as you can see you are having the notion that intelligence is a single entity, it isn't a single entity, that was the old way of seeing things.
The new way of seeing things is hopefully going to allow for all students to have success in their own way, because teaching will involve many different approaches, using as many of the different intelligences as possible.
There are also many ways to define intelligence, but it is important to choose definitions that allow for strengths and weaknesses to be developed. Some people say intelligence is being able to live happily.
Hope this helps a bit.
Grant
