This page describes the testing procedures that volunteers could do in order to Debian-IN team.
The Debian-IN team maintains the a list of packages which can be seen here.Most of the packages are about indic fonts, hyphenation packages for indic languages in various applications and Spell checkers for indic languages.
Volunteers who want to test would do well to join both the Debian-India mailing list as well as the Debian-in-workers team as well as look up people on the IRC at oftc.net with the channel named #debian-in.