Hello Shivaraj!

If you want to pursue medicine or dentistry in future, you have to get through the entrance exam NEET- National Eligibility Entrance Test, which is an all India level Entrance test to get admission in various medical and dental colleges.

There are various eligibility criteria for NEET- 

1. You should be of age 17 years by the 31st December of the exam year. Like if you planning to give in 2020, you should be 17years of age by 31st December, 2020 

2. Your core subjects in class 12th needs to be PCB and English 

3. You have to score a minimum of 50% in class 12th examination in order to get an admission in a college.

Therefore, a minimum of 50% in class 12th examination is must to be eligible for NEET. However, I would suggest you to put in your best in class 12th as the syllabus of entrance exam is quite common with that of Class 11th and 12th.

All the best!