Hello ishika

The marks required for bds fluctuates and changes every year depending on difficulty of paper, number of seats, number of students etc. The minimum requirement for this course is to qualify neet exam and to get college being ST candidate you should score minimum 350+ marks also depends from state to state. 

To know details on BDS use the link below 

https://www.google.com/amp/s/medicine.careers360.com/articles/bds/amp

Hope it help you