Hello FlyFreeWbe
It IS difficult to do the groundschool and the flying in three weeks. I did an RAF scholarship, which involved flying three or four times a day for three weeks, and completing most of the PPL groundschool. When you're not flying, you're reading about flying - but this does actually help - it's a total immersion in the aviation environment.
Yes, there is a lot of material, but when you understand the principles and have devised your own methods of remembering it, it does compress a lot. Familiarity can breed understanding.
Hint: If you get bored with Air Law or it's not sinking in, read up on Met - if the clouds don't make sense, study Principles of Flight, and so on. Also if it's not sinking in at all, try to relate it to a recent flight or to an imagined situation. Talk to other pilots and instructors about the material. Most importantly - remember the aim isn't just to pass the exams. The way I look at it, the exams are testing your knowledge of the information that will one day save your life. It concentrates the mind wonderfully.
I'd just started re-validated my lapsed PPL (it lasped 15 years ago), so I've got to do the full set of JAR PPL exams. I started studying in earnest three weeks ago, and I'm now ready to take the Air Law, Human Factors and Met. exams. And I have a full-time job (or at least that's what I tell my boss
)
Good luck with the studies.