Hello komal,

Please stay in touch with the website joinindianarmy.nic.in, as this is the official website where the form will be released.

The last date to apply was December 02, 2019 for 2020 exam. Therefore, now you will have to wait for another year. Apply for the form for 2021 examination. The forms are generally release in the month of November.

Plese refer the below link:

https://medicine.careers360.com/articles/indian-army-bsc-nursing-application-form
Refer to the below article for official information:

joinindianarmy.nic.in/Eligibility-military-nursing-service.htm

Hope this Helps