Hi Vihaa,

The best books for KAS exam are:

1. Kerala Administrative Service Cracker I & II, to buy follow the link given below:

* https://www.amazon.in/KERALA-ADMINISTRATIVE-SERVICE-CRACKER-PUBLICATIONS/dp/B0788PBQC8/ref=sr_1_1?ie=UTF8&qid=1529501788&sr=8-1&keywords=KAS+Exam

2. KAS Prelims - Karnataka Administrative Service (Paper - 1 & Paper - 2) Previous Questions Papers With Answers ( 2005, 2006, 2008, 2010, 2012, 2015, 2017), to buy follow the link given below:

* https://www.amazon.in/KAS-Prelims-Karnataka-Administrative-Questions/dp/B07BZZTJHH/ref=sr_1_2?ie=UTF8&qid=1529501788&sr=8-2&keywords=KAS+Exam

Thank you and best of luck.