Salamz,
For Pakistan Affairs,refer to Dogarsons book by anuthor Ehasanullah Saqib.
For Islamiat refer to the same publishers.I cannot recommend an author
just as yet cause u have'nt indicated whether u're taking the subject in
English or Urdu.I would suggest it in English but it really depends on one's
ease with either language.However,don't take it in English just cause of
social pressure cause this is an exam and u must treat it as such if u hope to make it.Bottom line is that your focus should be completely on tactics boosting your score.
Good luck with your decision.

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No one is listening,until you make a mistake !!