The books aren't that thick, come on and they're not as hard as I thought they would have been as English isn't my first language. I always find time to study and what's more important I enjoy it.. oh well, maybe not Air Law, its a bit boring, but the rest of the stuff is pretty interesting and it stays in my head! If I like then I learn it much quicker, don't know how about you.
The books also don't have 100 pages
The thinnest, Human Factors (..) has 243 pages
But You can get through the book pretty quick, by doing a chapter per day, then the exercises. Don't do it as it says on the schedule. Do it when you want to and when you feel like it. Honestly. I know studying for school work and flying is a bit hard, so divide your time somehow. I only do college work for 1.5h on every subject, and I have 3 ( and that's per week ), sometimes I don't even have to study at all, as I remember a lot of stuff I have heard in class, and what I read.
Don't hurry it to get 75% pass mark so you can go off and start studying for another exam. That's not the point. PPL knowledge will be useful in the future! At least that's what I heard.
