Please any one suggest me the best book on " Indian patent act" 

The best source is “Bare Act” and Rules, no alternative to that. Patent office manual can also help.

Additionally, Patent Law Practices and Procedures by NR Subbaram published by LexisNexis is a good one in my view.

@sy.patents-you have cleared indian patent agent exam?

No, Preparing for the exam.

Dear Navya,

You can enroll for distance education by Origiin IP Academy for preparation of Indian Patent Agent Exam. They have prepared the course material with comlete illustrtaion and detailed explaination of each and every section. You can see the testimonials of their students who cleared the exam by studying their course material.

Website is www.origiinipa.com, www.origiin.com

Regards,

AK