The exam for the DRDO Senior Administrative Officer-Grade-II is conducted by the Union Public Service Commission (UPSC) consists of only two stages – Preliminary and Interview. So, it is one such prestigious exam which involves only two stages.
Prelims is an objective-type examination consisting of two parts – Part-A English and Part-B as General Ability. So, only the candidates who clear the prelims are called for the interviews. Since, the notification is for few vacancies, generally the candidates shortlisted for interview are around 5-6times of the vacancy. So many would ask the role of luck. Well, it is an exam of accuracy and if you commit some blunders by virtue of anything(confusion, shortage of time, skipping the question, silly mistakes, etc) then you are automatically out of the race.