I also recommend what Candis01 did along with Peak Performance. Whichever you feel is most helpful, listen to that before studying, or even alternate them.
Since you are having "focus" issues, I would also recommend studying for intevals of no more than 20 - 30 minutes at a time, with 5 - 10 minute breaks in between.
In 3.5hrs you would effectively have 6 separate study sessions. The breaks in between give your mind time to rest and recharge.
Finally, you may want to consider the Photoreading Home Study Course. With all the material you need to cover, it may help you to retain more of the information you are studying.
