Hi Prakerty, 

 I would recommend you to retake the exam if you would like a decent MBBS / BDS exam. Quality of education matters a lot over saving one year. It is quite difficult to get admission with this score unless you want to pursue medicine abroad, you can probably join an institute at Georgia or Russia. Or you can either try one of the following options: 

1) Look at study abroad programs in which you can do your MBBS from a different country like Russia or some other country. 

2) Drop  another year for NEET. And expect yourself to do well next year but the only problem is that people are usually disheartened after failing in such competitive examinations. So go for it,  if you feel confident and if you know that you'll clear NEET no matter what otherwise learning stuff with no confidence on yourself can cause you to fall behind in your studies. 

3) Change your field! You can look to go into research fields by taking admission in B.Sc. or you  can study for CLAT if you feel that medical field is not working out for you. I have seen people leaving engineering/medical preparations for CLAT, and they were successful at accomplishing a great rank (even under 100 AIR)… People say that it's comparatively easier than engineering/medical so it might work out for you.

And most importantly don't waste your year, if you are truly passionate about being a doctor then only take this step of dropping a year or else you are wasting your time. If you do then study hard! And try to score 550+ for decent colleges. 

Don't feel disheartened, keep trying and keep learning! All the best for your future!

Hope this helps!

Good luck! :)