Before your travel to India you need to make your visa a few months in advance : For your indian visa, your passport  has to be valid at least 6 months after your entrance in India with 3 blnk pages 

The vaccines recommended before your trip to India

• universal vaccines (DTCP, hepatitis B);
• measles, mumps, rubella (MMR);
• Hepatitis A (highly recommended);
• Typhoid (recommended)
• If you extend your stay in northern India: meningococcal meningitis (A + C) (recommended, especially for travelers under 40 years);
• for trekkers in Northern India: rage;
• for expatriates and / or rural stays (in North India, especially in rice fields areas and during the raining season, in South India, for longer than one month stays): Japanese encephalitis.

The best seasons for your trip to India

The best season to travel to India at the end of March in mid-November,
Southeast and extreme south, because of the monsoon tardive.le Southeast and the extreme south, due to the late monsoon.