Best Books for ONGC Graduate Trainee | Reference Books for ONGC Graduate Trainee (Electrical Engineering) Written Test book Best Books for ONGC Graduate Trainee | Reference Books for ONGC Graduate Trainee (Electrical Engineering) Written Test sarkariresultsera@gmail.com September 23, 2024 Books for ONGC Graduate Trainee : Recruitment to the post of Graduate Trainee in Electricity Department is... Read More Read more about Best Books for ONGC Graduate Trainee | Reference Books for ONGC Graduate Trainee (Electrical Engineering) Written Test