There is tons of research on learning styles and you don't have to go buy a book to learn about it. There are many many many sites where you can go and take a quiz to see where your strengths and weaknesses are. I am an audio learner mostly followed by visual then by writing.
So when I was in college I learned I needed to have a tape recorder and put my notebooks and text book away and simply record the lecture and listen/watch the teacher. If I took notes nothing made sense because I missed over half of what the professor said.
If I did this then later as I listened to the lecture I'd write specific points down that I'd retain way more of what the professor had taught.
I can still recall perfectly a lot of conversations I've had over my life with people. I can see their mouths moving and hear their voices.
By studying and learning about learning styles I was able to learn more effectively.
You can do this too. You simply need to google learning styles the look at the different sites and start making some decisions on how your little guy might more effectively