Go Back Through
I have the same schedule with every book I read. After a mandatory 1–2 week waiting period after finishing, I go back through the book with a stack of 4×6 index cards. One these cards, I write out–by hand–all the passages I have noted as being important.
It worked wonders for me: at 19, I was a Hollywood executive, I was at 21 I was the director of marketing for a publicly traded company, and at 24 I’d worked on 5 bestselling books and sold my own to the biggest publisher in the world. I may have been a college drop out but I have had the best teachers in the world: tough books.