It takes daily practice.
In my skip from 7th to 10th, my history teacher made us all read and take notes or take notes from her lectures. She graded us on the note taking. It was torture for me for the first few weeks as I was writing for 45-75 minutes every day and she checked our work EVERY day. I remember walking out of there with a sore, cramped hand and a bruised ego from the feedback. It worked.
I would suggest copying a print book to a composition book - pick a page a day to do. Then review. I would aim for high quality at first then both quality and quantity and then use different kinds of pens and pencils.
I'd pick a book on something DS likes or which is broken up well - perhaps poetry or "how things work" that has short sections and which are also interesting.
