IQ as a given, stable figure has been refuted. We now know that education can help rise IQ-scores. This research by Stuart J. Ritchie, Timothy C. Bates, Geoff Der, John M. Starr, and Ian J. Deary confirms this causal relation, but learns us that despite an improved cognitive reserve, but it doesn’t make us process cognitive tasks faster. More specific in this research they looked at the IQ-test scores at age 11 and compared with later life at elderly age. The researcher do note that any influence of education before the age of 11 is not included in this research.

Abstract of the research:

Recent reports suggest a causal relationship between education and IQ, which has implications for cognitive development and aging—education may improve cognitive reserve. In two longitudinal cohorts, we tested the association between education and lifetime cognitive change. We then tested whether education is linked to improved scores on processing-speed variables such as reaction time, which are associated with both IQ and longevity. Controlling for childhood IQ score, we found that education was positively associated with IQ at ages 79 (Sample 1) and 70 (Sample 2), and more strongly for participants with lower initial IQ scores. Education, however, showed no significant association with processing speed, measured at ages 83 and 70. Increased education may enhance important later life cognitive capacities, but does not appear to improve more fundamental aspects of cognitive processing.