Asslam o Alaikum

I am going to appear in CSS-2014 and have geography as one of my optinal courses. I have two questions:
1- Is selective study possible and safe for Geography? If yes, please suggest me which ones? Or tell me how I can shortlist the topics? I am analysing past papers but need help.
2- It'd be really great if any senior can guide about the best, yet one, book for each paper of geography. I have gone through like almost all the thhreads on the forum and there is this plethora of books mentioned. I seriously need help over this. Please suggest me one book for each of the two papers.

Thank you in anticipation