Hello Zinnatul !

You can consider the following private polytechnic colleges in west bengal :-

1. Durgapur polytechnic college (DPC)

2. The new horizons of institute of technology 

3. Santiniketan polytechnic durgapur 

4. Bengal college of engineering and technology 

5. Luthfaa polytechnic institute 

6. NS polytechnic college 

7. Camellia institute of polytechnic 

8. Dr. BC royal polytechnic 

9. Elite polytechnic institute 

10. Global institute of science and technology 

Hope this answer was helpful !