Go to fpsc.gov.pk and click on the link publications. Over there you can read the annual reports of the FPSC like that of 2009 and 2010 in which they have given a general outline of what is expected in your papers. Unfortunately there is no detailed marking scheme available.

I took European History and Political Science in 2012 so still waiting for the result. Hence, I might not be in the best position to guide you in these subjects yet.

However, I found D Thomsons Europe since Napoleon really helpful. Its very lengthy and sometimes extremely irrelevant but it gives a lot of analysis on important topics which is really good for writing good answers. E.g it gives an extremely nuanced analysis on Napoleons character (it gives both his positive traits and his negative traits). The author does not treat him with the heroism that other books treat him with but gives a balanced account (a similar analysis is also presented for other important individuals such as Napoleon III, Bismarck, Hitler etc.) There are always questions related to the feats, achievements and disappointments of such characters. Early in my studies, I also faced this problem with European History that I tended to forget the nitty gritty details but I think by the time the exam is near and if you have gone through D Thomson a couple of times you'll remember. Since you have ample time remaining you can go through it a few more times and this won't really be a problem. You can also buy any abridged book of Euro History such as Stuart Millers book which is really useful for MCQ's and also to revise before exams. This book also gives a better picture of the causes of the French Revolution which are not that well covered by D Thomson. You can also consult the internet and look for the topics and sub topics from the syllabus, this will help in broadening your knowledge base and also help you reinforce and remember your knowledge about the topics that you have already studied.

For Pol Sci I consulted Mazhar ul Haqs book for the theory portion. It covers all topics really well. For western philosophers I consulted Harmon's book which is also comprehensive except for Mao I think (and Mao is not very important). For Muslim philosophers I consulted CSSForum notes which are very well compiled by a member. For paper two I consulted Kealy's World Consitutions. It does not contain the constitutions of some countries like Turkey and Iran i think. For these there is ample material on the internet and wikipedia to cover them. Also the book as it is published a few years ago might not contain updated information for the constitutions it covers hence you will have to consult the internet to update some outdated information (E.g the book says there is no Supreme Court in the UK however this was recently created by the UK govt. a few years back).

Good luck with your studies