All the questions come from the PMBOK (Project Management Body of Knowledge) See the three bullet points on page 8 of the link I am adding for the CAPM handbook. Keep in mind that the 4th addition of the PMBOK was release within the month so make sure you study from that one. I'm not sure what has changed since I took my PMP under the third addition, but I know from 2nd to 3rd additions of the PMBOK there were WBS structures that did a 180 shift.
On PMI's website it looks like they are selling the 3rd addition (image added), not sure when the 4th will be shipped. I have mine, but it is encrypted under my PMP number and we are not supposed to distribute them. Taking a prep course is a good idea.
I did Crosswinds study and I will include its link as well, but I am certain there are several good ones.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.