In accordance with my previous post, when I suggested making audio notes, you can alternatively use “read out loud” feature of pdf readers. It is given under “View” menu in Adobe reader I use this feature to study descriptive subjects like history and literature.
However, this method works well for e-books and not the scanned or “captured” notes. Moreover, the pronunciation is weird sometimes and the software reads everything, even the page numbers.
Nevertheless, it is better to hear instead of merely reading. So if you feel short of time, you can use this feature. There is also a provision to control the speed and pause whenever you want, giving you more flexibility.
Let me know about your experience with ebooks and study techniques you use in the comments.