Looking for ways to learn faster. I have lots of books to finish by September. They are all technical in nature. Subjects are: Economics & related, Mathematics. Also, highschool level (as in International Mathematical Olympiad, International Economics Olympiad).
What I'm currently doing is:
1. Wake up at 6:00 and study until I can't anymore
2. Listen to a chapter of an audiobook (of these books) while playing Dragon Age
3. Repeat until dinner
4. Play a puzzle game for 30mins
5. Study until I can't anymore, then play Dragon Age while listening to a chapter of an audiobook
6. Repeat until 7pm then study for 2h in a row and go to sleep at 9pm

Note: My maximum duration of studying in a row is 4h. Also, note that I enjoy this and have done this for 2 weeks now, so saying 'you will eventually have a long break' is pointless.
Moreover, I already employ speed reading (really only for econ & related since it doesn't really work for math), so can't do much there.

Thanks in advance