Well Indo-pak history is also low scoring( K.Ali is the best book for indo pak), Try to turn your thought to British history which is single book study subject, if not, then indo pak is ok.
Remaining 100 you can cover by opting:
US History.
IR
Language...
yeah more important, you don't need to read those books which are suggested in the syllabus. do one thing more, text me on my email which is available on my profile il send you complete study stuff for your compulsory coupled with optional..ryte? one thing, text me on msn or yahoo...