[jjk166]

IQ doesn't improve anything, it is a measurement. You don't have good reasoning capability because you have a high IQ, you have a high IQ because you have good reasoning capability. It's also not something fixed. Your IQ will naturally vary over time due to both controllable and environmental factors, including some aspects of education.

Education is no substitute for IQ any more than IQ could be substituted for education. A high IQ individual has the potential to better utilize an education, all else being equal. Whether education or reasoning ability is more critical is very situational. In a tour guide, you definitely would prefer someone knowledgeable, in a detective you really want someone clever. At least for the moment the preferred workload distribution is generally for computers to help us with information retrieval and low level analysis which education trains us for while a human performs high level reasoning tasks which are represented by IQ.