Is Dr. kc sinha good for coordinate geometry for preparing iit jee ?

from your point of view which book you thought best for coordinate geometry?

in my view sl loney coordinate geometry is the best book for coordinate geometry as it covers all topic required for iitjjee and many previous year questions have come directly from this book

His book is really good to build concepts. However, to practice more problems similar to what would be asked in IIT JEE, you need to take help from study material of reputed coachings like FIITJEE, askIITians, Resonance etc.

in my opinion you must try arihant intead of k.c.sinha... as it has proved to be one of the best books in market since many years