As you may be able to tell, Im not a pilot, Im only 18 but am aspiring to become one.
In response to your questions (more experienced members may be able to correct me on my answers, so feel free).
1. You need an ATPL (Airline Transport Pilots license), this is a CPL with IR, and usually MCC.
2. I've got an assessment day at OAT coming up soon and I personally dont really feel I need any brushing up on Maths/Physics, I've just finished college, but you may want to touch up on certain areas of maths and physics, at a GCSE level (
http://www.bbc.co.uk/bitesize I think!).
3. Not a Clue, use google/here/other aviation forums to try and find some fliying schools in India, you can always ask advice on here before progressing anywhere.
4. All depends, Im looking at an integrated course at OAT and that is approx. 65 weeks, generally about 18 months I believe.
Lee H ;