In observational studies anemia and iron deficiency are associated with cognitive deficits , suggesting that iron supplementation may improve cognitive function.
Iron can improve cognitive domains: concentration,intelligence ,memory, psychomotor skills and scholastic achievement.
If the child is anemic, iron supplementation can improve I Q by 2.5 points.
So if your child is poor in studies or getting worse in scholastic performance consult your pediatrician for signs of anemia and iron deficiency .
(ref . Nutritional journal jan2010 )