There is no such information available on the official website if mit also companies like isro hire only from iit and nit but you do not need to worry as for btech graduates icrb exam is held which has two stages written and interview and you get selected on that basis but for mtech it is a bit tricky as you have to apply at various centres of isro depending upon vacancy if any and there is no central exam for mtech graduates so you have to move accordingly