Hello dear student

If you want to take admission in top nursing colleges than you must the entrance exam.

You are from West Bengal so you can apply for west bengal paramedical entrance examination and if you qualify  than you will get a Seats according to cutoff of respective collages.

Please visit the link for more information and college details of paramedical.

https://medicine.careers360.com/colleges/list-of-general-nursing-and-midwifery-colleges-in-kolkata

Hope that's helpful

Best of luck