Usually competitive examinations doesn't require any previous work experience. But in some specialized vacancies like IBPS SO and certain supervisory level jobs do demand the same. If you are a fresher and a graduate you can appear for Bank , Insurance , SSC exams which actually doesn't demand any prior work experience. Stay focused in Exam preparation definitely u will be able to crack the exam. if any doubts, pls feel free to ask !
Wish you Good luck !