1- western political thought by Muhammad Aslam Chaudhry..it is simple as compared to Judd harmon's book.
2-Do not read Aslam chudhry's book Muslim political thought.Complete waste of time.Just read Al-Farabi,Ibn khaldun and Iqbal from notes on css forum and it is enough.
3-Political science theory and practice by Mazharul haq.Highly recommended for Part 2 of Political scince part 1 paper.
For Part 2 of Pol scince u need to consult different resources.Youtube videos,slides,wikipedia articles and constitutions.
there Jahangir world times book is copy-paste.M sohail Bhatti is also waste of money.