There are lot of opportunities for a graduate in mathematics you can go for higher studies by doing Masters in mathematics you can also go for PhD programs in from prestigious Institute suggest Indian statistical institute for IIT also in case you are interested in public service you can join civil services by appearing in the entrance examination soap based on your interest there are various options of first you need to clarify your interest and based upon your interest you need to find the career opportunities and higher studies opportunity cost for a graduate in mathematics almost all the options are available therefore without specifying the interest we cannot help you much on this regard there for first keep finding interest with.