From NDLS, you can take express trains to Jamshedpur (Tatanagar), including the Rajdhani Express, the Purshottam Express, and the Nelalchal Express.
Jamshedpur's closest airport is in Ranchi, although you can also get there via train. From Delhi, you can fly to Ranchi, where the bus ride to JSR will just take two hours and cost a fraction of the price. Simply stating, "I want to go to XLRI JSR," at a bus or train station will get you there.