In essence what Genghis Khan did during his lifetime was - he 'prepared' the territories for the future permanent Mongol conquests headed by his successors: the primary Mongol enemies murdered, the awe inspired, the strategic points taken, the terrain explored. The Mongol administration on the conquered territories was set by Genghis Khan but it was minimal to the extreme, and mostly in places closer to Mongolia proper. The actual conquering took place near Mongolia proper and it was prototype, example set by Genghis Khan for all further Mongol empire-building. India doesn't fit here.