If you have completed Engineering course then also you are applicable for IES exam OR If you have M.Sc degree in Physics , Radio Physics then you are applicable for IES exam.
Those candidate have completed engineering degree with below given department are applicable for IES exam-
1.Civil Engineering
2.Electrical Engineering
3.Mechanical engineering.
4.Electronics and Communication Engineering.
Final year student also eligible for IES exam .
The applicant age should between 21 yrs to 30 yrs.Age relaxation is provide for SC/ST/OBC candidate.
Number of attempts for IES exam is for general student it is 4., for OBC it is 7 times. and for SC/ST it is 9 time.
Hope this answers your question.