If you are interested in doing PG you can prepare for GATE exam you can opt for aeronautical engineering if you are interested. If you are interested in management you can go for MBA. 

Graduate Aptitude Test in Engineering (GATE) is conducted by Indian Institute of Science (IISc), Bangalore and seven Indian Institutes of Technology (IITs) namely IIT Bombay, IIT Delhi, IIT Guwahati, IIT Kanpur, IIT Kharagpur, IIT Madras and IIT Roorkee. The entrance exam is held for PG admissions to Engineering/ Technology/ Architecture and Science. GATE is a national level PG engineering entrance examination, offers admissions to M.E./M.Tech/Ph.D at the IITs, NITs, GFTIs and other universities in India, Several Public Sector Undertakings (PSUs) and research organizations also recruit on the basis of GATE scores.

To know more about GATE you can refer below link

GATE Details

Good Luck!!