Hello Raghu,

Well if u have minimum qualification of graduation in EEE i.e. B.e. or B.tech. U have to score well in gate exam which is the prerequisite to join drdo..go through the official website of drdo i.e. search for the notification for scientist and apply for the same. If u score good(above 60 for 100) in the gate exam you will have more chances to get call for interview based on the gate score and interview performance you will be selected for scientist post in DRDO.

So all you have to do is plan to get a good score in gate  exam and gain good knowledge in all your subjects.

All the best!