I choose bds as all medical students do the same when not getting admission to MBBS students goes towards BDS.. in my college all departments have enough faculty 100 students and 3-4 faculty. exam in bds total 3 times a 1st exam terminal, 2nd preliminary, 3rd University exam. all exams are easy at the college level, but the University exam is very tough, you have read thoroughly to the syllabus to crack with good marks. and u pass at 50 % there is no rule of 33% you have to get a minimum of 50% to qualify for the exam.