Has anyone studied Pak affairs book by Dr. Liaquat Niazi & M. Usmani?? since it is covering vast variety of topics (except the constitutions) but no one is recommending it here.

I've mostly been suggested books like Trek to Pakistan, I.H Qureshi and K.K Aziz but none of them seems to be whole.

Seniors please give reviews

Please take a look at the required readings in FPSC CE syllabus. If this book covers major topics, you can select it. It is a common misconception that there are certain books, only with the help of which, aspirants can secure marks. One can select multiple books and can cover individual topics from multiple books depending upon the content of different books.

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The one who is most deserving of thanks and praise from people is Allah

It depends on you really ,that which books you want to use. If you are comfortable with Niazi's book ,then go for it. All other books are good too. Thing is this that ,book by Niazi is from jahangir world times ,and they make sure to cover whole syllabus. Though ,its per my knowledge and experience with these books ,that they rely on copy pasted material. But now a days trend is changing , and they are trying to go away from copy paste approach. So, it really depends on you that which book you want to use. Just read some pages from it,so that you come to know the writing style and vocabulary.
And , everyone is recommending trek,I.H,struggle for Pakistan etc. Because they have prepared from them so they now better about them. I prepared from them too. Scored more than 70 in CSS and PMS. And , I think that trek is an awesome book without any comparison. But if you start remembering stuff in it , then it's a very difficult task. Because author managed to give so much information in this small book. For me, quality of this book is awesome. And I have read struggle for Pakistan too ,it's quality is good too. So for prepartition , trek . And for post well you can decide to use I.H or maybe Liaquat Niazi's book. But do read some pages before. Because sometimes you buy book ,just because seniors here have advised it. And then you end up getting a book which don't suit you. And then you start to struggle to grasp the vocabulary of that book and to gain knowledge etc. Niazi has got whole syllabus covered ,so it's good if you want to make it your basic book, and then add stuff like quotes,maps,figures,facts etc from other sources. Remember ,that everyone is going to read from these books. Those who score more in paper add other stuff. And basically theur way of attempting paper is better than others and upto the mark.
Hope it helps.

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

Thankyou so much for your detailed response

I have read it and I didn't like it. But keep it at your side (if you have already bought it) as it is according to the syllabus, so you won't stray away from the track. And where you thought it is not good enough you can consult the internet.