Assalam o alaikum!

I have just applied for CSS 2019 for the sake of exams only; as everyone suggested me to take exams whether or not I am prepared. It's better to fail, availing the chance than without. Anyway, I did and now have just one month to prepare.
Kindly suggest me one book for each of the subjects I have chosen. Here's the list of my optional subjects:

1. Town Planning and Urban Management
2. Islamic History and Culture
3. Political Science
4. Environmental Sciences
5. Sociology

Also direct me to the links or notes for compulsory subjects.
I shall be highly obliged for the favor.

Jazakomallah Khair.

Kind Regards