Hello dear student,
As you have not mentioned you category and also the state of your domicile so I am here sharing the marks you need to obtain in NEET looking into previous year cut off marks in 2019. It is 15% all India quota for general category student. if you can give me precise information about your category and the state of domicile then I will be able to give you correct and more precise information. Till then kindly see into this information maybe this is inform to you.

Punjab dental government College and hospital,  Amritsar - 517 marks ( previous year cutoff off marks under 15% AIQ)
Government dental College , Patiala - 520 marks (looking into previous year cut off marks under 15% all India quota )
I hope this is helpful to you kindly for any more for the information feel free to ask again.
Thank you and best wishes