NEET Preparation

As per the expert guidance, NCERT is not sufficient to clear the NEET exam because the information is not ample, topics are not explained so deeply. You can refer NCERT for the topics. For the competitor analysis, you should also take help from the other books. Coaching can only help you. Qualifying the exam is depends on your self-preparation how you made your strategy and crack NEET.

If you think you can do better next time then wait and try once again, else do not wait for another try. You have already crossed many barriers of the exam so take whatever college/university you are choosing.

As you've failed in chemistry, you are not eligible to apply for the exam. First, complete your 12th with a minimum of 50% aggregate marks and then apply for NEET.

NCERT will definitely give you a good foundation for the preparation but I would not say that, only NCERT Is sufficient enough for preparations. NEET is a multiple choice questions type examination. So, you definitely have to go through many multiple choice type question banks and furthermore you should definitely go through some good books for strengthening your preparations. All the best !

Working towards achieving your dream is never a bad idea, but one should always be passionate and whole heartedly involved in the process to achieve what he wants. So, I would recommend that if you are ambitious enough and you think you can crack the entrance by preparing a year more then definitely it's a good decision to drop.
All the best!

See, to be clear you can't manage both B.Sc and NEET together.
There is a saying that do not put each foot on different boats. So I suggest that do not mess up with 2 different courses. Just be clear about what is your goal, it is either B.Sc or getting MBBS through NEET. But remember one thing, you should be confident about what you want to choose. Your goal should be clear.

Can you please tell me your location, so that I can guide you accordingly?

They are good in medical, but faculty quality is not good in all the branch. Resonance: for JEE Main & Advanced resonance is good, but their Kolkata branch faculty quality is too poor. Study material is good.

Under no category of reservation, you can get into MBBS course in India with such a low score. So, definitely, you should try another time only if you are passionate to get into MBBS. Otherwise, moving on into any other course would be good.