Dear member,
In the last few years,islamiat compulsory paper is mostly based on current issues and problems faced by muslims generally.
So try grip current affairs especially if they are in anyway relevant to islam/muslims and muslim ummah. Try to find answers to such issues in islamic perspective.i.e. Quran,hadith,seerat i nabvi,khulfa i rashdeen, muslim rule/history etc.
1:Read jang newspaper friday features (colour page outer side of editorial page)
2:Monthly "Tarjuman ul Quran "by khurshied ahmed.
And You can score nicely in subjective portion!
Regards!