Book by Iqra riazzuddin is quite good. It has got diagrams, quotes, facts and figures etc. Though ,it seems like it's copy pasted from different places . But still it's quite good as you have good all this stuff at one place. But there is a lot of repitition of topics,and I think this thing is due to syllabus of public administration and due to this reason that topics overlap with one another.
But with this book go through Fpsc suggested readings too. Only if you want to score high.

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''Sufficient for us is Allah , and He is the best Disposer of affairs" Al-Quran