you think that are you as an average student but it is depend on your self confidence,concentration on your goal,timing.
for passing the entrance exam of AIPMT so discipline is must in your
you can join the good coaching classes which help you very much in your studies.
further you spend your time for study atlest 8 to 10 hours in a day.
you can go with samples papers,question bank etc. for preparation of exam.
definetely you can pass the exam.
all the best...