More Time At School 'boots IQ'

I recently heard that apparently spending more time at school will boost a childs IQ. An extra year in school could boost IQ by 4 points. Is it worth it? Do children really want to spend more time in school for increasing IQ points?

However, the authors of this study said they were not sure if it applies to all children. There are so many factors that need to be considered, for example, education at each school is different. Every child is different. There have been so many articles on IQ, but does IQ really prove anything? Some adults and children who many not have a high IQ might be really creative and intelligent in other areas, for example music. In my opinion IQ tests do give an indication of how intelligent a person is but there are so many factors that effect intelligence.
BBC News - more info