What all are the Licences available for a Ham in India?

There are four operating licences and one receiving licence. They are Restricted Grade, Grade-II, Grade-I and Advanced Amateur Wireless Telegraph Station licences and Short Wave Listeners (SWL) Licence. With SWL licence, one can possess only a Communication Receiver. But with the four, one can possess and operate transmitter and receiver. All licences are available direct to the newcomers. However the minimum age is 12 years for SWL, Restricted and Grade-II, 14 years for Grade-I and 18 years for Advanced Grade Licence