Hello,
For MBBS, there are two types of colleges, government and private.
For government colleges the fees for MBBS course is around 60,000-90,000 Rs per year.
For private colleges the fees is around 3 lakh to 7 lakh per year.
And if you take admissions to private colleges through management quota, the taotal fees would be more than 20 lakhs.

The admissions to government medical colleges based on NEET is given under two categories-All India quota and state quota.
So, the minimum fees would be in the case you join government colleges in your state through state quota (85%).

Check out the knockout program for NEET 2020, it will be very useful for your preparation
https://learn.careers360.com/knockout-neet-may/

Follow this link for more information on NEET
https://www.google.com/amp/s/medicine.careers360.com/articles/neet-application-form/amp

Good luck