Meena,
As per what I see, I think you will appear from New Delhi . You can directly visit the British Council in ND and pay by cash. Here is the URL for it.
http://www.ielts.britishcouncil.org.in/#
Also , you get a prep material for the exam. I also downloaded some materials from forums.I have not had any classes or trainings. By what I read, I guess you just needa be good at english to clear it. Hopefully thats the case. Keeping my fingers crossed.