Originally Posted by alimallah

For Inorganic chemistry these two books are well enough and easy to understand and cover all the syllabus of PCS/CSS:

Inorganic chemistry by Zafar Iqbal
Inorganic chemistry by R.D Madan

For the organic portion only read following book as its easy to understand, it starts from very basic and covers upto master level organic syllabus.

Organic chemistry by M. Younis.