Hey there!

If you are confident enough, that by solely investing a year in NEET preparation could guarantee you a seat in MBBS, then go ahead and live your dream of becoming a doctor.

However, even for a fraction of second you feel otherwise, then its wise to take an admission in BSc and simultaneously prepare for NEET on the other side.

It's totally your decision and how much time you have to make a difference. Considering you have already spent a year or more previously in NEET preparation, then you may take admission in BSc. However, if this is the first time you'd be giving NEET then there is no harm in investing a year in the preparation. Hope this helps.

Good luck!