What are the best Indian brain foods to be given to kids during exams?

Ever since, I was a kid, I had seen my mother giving my brothers and me almonds and walnuts so that we could become sharp. Well! That is still questionable whether they really work on us or not. ;) Apart from this, blueberries, fish too are considered to be good to enhance brain power. http://www.rd.com/health/conditions/best-brain-food/ http://www.webmd.com/food-recipes/healthy-foods-eat-brain-power http://www.eatingwell.com/nutrition_health/healthy_aging/eat_for_a_sharper_mind_5_brain_boosting_foods?page=3 http://www.prevention.com/health/best-brain-foods