how to prepare for rrb secunderabad exam? i want to crack the exam definitely

RRB is conducting a computerized common entrance test this year for their 21 boards of which Secunderabad is one. The first step is to read through the RRB 2016 notification. You can download it here: https://cracku.in/railways/info
Solving previous years RRB question papers, Practising questions from General Awareness and General Science and attempting mock tests can go a long way in succeeding in the exam. This has been explained in greater detail in Cracku blog here: https://cracku.in/blog/how-to-practice-for-rrb-online-exam-2016/