hi,

see as per last three years ISRO requirements notifications, ISRO has more hiring for graduate engineers as scientist B position. the stream of engineering which  are at top hiring is for b.tech in  mechanical engineering , electronics and communication engineering, computer science engineering degree holders .

however m.sc graduates are worked as scientific officers, however the Institution from where  you would complete the course would play a vital role. IITS, iisc graduates has on campus placement also for ISRO requirement.