There is absolutely no prerequisite, except, you win a writing competition to work at Google India.
If you have a clear, concise style and can use words to inform and persuade consumers, Google would like to hear from you. Google is looking for exceptional individuals to join the Google team in India, and organising a contest the Google Wordmasters Challenge to find and reward India’s best writers.
The contest will be judged by a panel of respected professional writers.
And hurry. The contest is open only to the first 300 participants, so the sooner you enter, the better. The deadline for entries is 25th September 2006.
More info @ Google website