FMGE is an examination to allow Indian Medical Graduates who have studied abroad to practise legally in India. If you have studied MBBS, you should have attended Clinical postings and should have completed your mandatory internship period of the Country you have studied MBBS in. That should be an enough practical exposure. But if you do not have any idea about practical knowledge, it is alarming. You might not get posted in Government Hospitals right away because it is a Government job. You may have to start working in a small clinic first. Rather than working it should be a learning experience for you.