Hello aspirant. Kusum Devi Sunderlal Jain Dentall Hospital is a private dental college in West Bengal. As I can see from your profile, you are a West Bengal domicile holder and  I believe you will be able to get admission in this college as can be seen from the 2020 cut off trend-

1, General- 529

2. Management quota- 301

3. SC- 393

4. ST- 159

There is no authentic information on the cut off for gen-ews category as you mentioned but gen-ews category's cut off is more or less similar to categories other than unreserved. If you want other suggestions for private dental colleges in West Bengal, here it is-

1. Guru Nanak Institute of Dental Sciences, Kolkata
2. Haldia Institute of Dental Sciences
3. Burdwan Dental College and Hospital

Good luck!