awesome sir, i am dr anjum from Balochistan,a css aspirant for 2016.. as syllabus and grouping have been changed... according to new grouping i have following combination

IR
Psychology
zoology
public administration
criminology or indo-pak history

please suggest me books for compulsory subjects...
which book i should follow for comprehension, grammer? currently i am reading exploring the world of English
how to develop techniques and methodology of essay writing?
which books to follow for pak affairs and islamiat?

please sir guide me