Dear,

There are certain papers that complement each other in preparation, for example: History of Pak India helps in Pak studies & US history helps in CA as well as in IR etc. Choose your optional in such a way that will help in lessening your burden.

Moreover, there are some papers that gives you good score on average, such as regional language, environmental sciences, criminology etc.

As far as P.ad is concerned, it will require a bit more effort from your end. You will have to cover the syllabus from multiple sources, focusing on two broad categories: International as well as Pakistani Administration.

I.law's paper and especially it's objective portion was more like applied I.law. It complements IR 2.

In Lahore, there is world times academy, KIPS, Officers etc. I will suggest you to find a private tutor and prepare your own notes. It'll help you a lot in the long run.