Hello aspirant!
Hope you are doing well.

Your question is not clear.
Anyways I am giving you a brief about bds course

BDS (Bachelor of Dental Surgery) is a 5-years undergraduate programThe 5-year program involves 4 years of classroom education and 1 year of compulsory rotating internship.
Admissions to BDS usually takes place through the national level NEET exam.
After 12th you can give neet exam.
Here is the qualifying criteria of neet:

• Candidates have to pass a recognized Higher/Senior Secondary Examination or the Indian School Certificate Examination equivalent to 10+2 Higher/Senior Secondary Examination after a period of 12 years study
• NIOS candidates are eligible for now subject to the matter subjudice in the court.
• Candidates must have completed 17 years at the time of admission or before December 31 of the year of admission.

Here are some tips on how to prepare for neet:
https://medicine.careers360.com/articles/how-prepare-for-neet-in-6-months

Hope this helps you
All the best