if i'm an average student and i want to go in medical line then what course i should to do

If you want to go into medical line, first of all you need to believe in yourself and come out of being an average student to being a smart learner because you'll face this things when you take science in your 10+2 and prepare for competitive entrance exam with a heavy competition around.

So you need to take Science Ofcourse in your 10+2 and need to prepare for NEET entrance exam which will be an entry to all the medical courses available ie MBBS, BDS, BAMS, BHMS or BPT, etc. NEET is an MCQ based examination with 3 subjects in it - Physics (180 marks),  Chemistry (180 marks) and Biology (360 marks).

Best wishes. Thank-you.