how can i get nurse seat after completing 12th

Hey dear,
Yes you can.

Candidates must have completed class 12 with PCB (Physics, Chemistry, and Biology) subjects to be eligible for the BSc (Post-Basic) programme. One needs to register as an RNRM (Registered Nurse Registered Midwife) with the State Nurses Registration Council and get a certificate in GNM (General Nursing Midwifery).
Additionally, the eligibility requirements vary depending on the level of nursing courses and are as follows: All participants in nursing certificate, diploma, and undergraduate programmes must have completed grade 12 with a grade from an accredited board. After class 10, certain students may also apply for a variety of certification programmes.

To know more -
https://www.careers360.com/courses/articles/nursing-courses-after-12th-counar

Thank you.