DRDO doesn't specify the GATE cutoffs. You see its a defence organization and the information from it is pretty minimal. However since it is a highly coveted job, the GATE scores are high as per reports from students. You can check the GATE scores for many PSUs herehttps://engineering.careers360.com/articles/what-are-gate-scores-for-psu-recruitment. If you notice the scores given by many PSUs are on the higher range. So you may expect that it will be more or less the same. The only plus point with DRDO is that they recruit on the basis of valid GATE scores. So in 2016 they took candidates on the basis of 2015 and 2016 scores unlike other PSUs.