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Exam grades 'more nature than nurture'
http://www.bbc.co.uk/news/health-25337953
The research was carried out on identical and non-identical twins
Genetic influence explains almost 60% of the variation in GCSE exam results, twin studies suggest.
Scientists studied academic performance in more than 11,000 identical and non-identical 16-year-old twins in the UK.
The team from King's College London found that on average, genes explained 58% of differences between GCSE scores in core subjects such as maths.
Differences in grades due to environment, such as schools and families, accounted for about 36%.