Actually it doesn't depend on your education as long as you are eligible to take the exam. If one clears the written part and he is a B.A it may cause him a few marks in interview but if he/she is really intelligent and influencing then those marks can be made up. So B.A or Master's actually it's your preparation in exams and integrity of your personality in interview as a whole that matters. By the way it's a shame that most of us don't know that 16 years education is actually equivalent to Masters. We are talking here of B.A (not honors) and M.A/M.Sc.