There are study techniques that really improve memory. I don't quite understand what you mean by short term memory. Even the people that appear to glance at a word, and know it the next day use techniques to do so. And some superbright people can literally do just that.
I think the main question is why post to an ADHD forum. If he has trouble memorizing because he can't concentrate (ADD/ADHD), that is very different than just having trouble memorizing. Although the techniques will work for both. Its just a lot more difficult and time consuming for the ADD/ADHD child. There is no magical diet that will help. A good nutritional diet is always important.
So essentially, I need more information so that I can help you. Do you suspect ADHD? What subject is he having trouble in? Has he always had this problem? Does he think the teacher is a jerk? Depending on what is going on I have some books, that I can recommend.
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