I scored 70 in Indo-Pak Css-2019.

My advice is don't opt for it as the course is very lengthy and scoring threshold is far below than that of US History, European or British History.

But if you’re still insisting , then I would recommend 3 books:

712-1856: Book by Sohail Bhatti (don't remember the exact name..but it covers this time period)

1857-1947: Trek to Pakistan by Ahmed Sayeed.

1947 to present : Constitutional and political history by Hamid Khan (3 questions in the 2019 paper came from this book).

DO NOT study from the JWT, Advanced or any other guide books as the examiner knows majority of the candidates consult these guidebooks, hence, he designs the paper in such a manner that make these useless.