Since I got to know that you are from an IIT, First of all I want to congratulate you for selection in such premier institution. Bhai I know ES is one of the toughest exam, but atleast complete your B.Tech. And you wish to work for railway after the degree try all the exams i.e. RRB( JE SSE TA CA) IAS (IRAS) IES (IRSE/IRSEE/IRSME/IRSTE). But Technician grade I wont recommend for you. Your learning for cracking JEE advanced will help you alot for RRB exam.