As you have not mentioned the name of college where you want to peruse GNM Degree in ,speaking generally the college fees varies from collage to college.The minimum fees can range between Rs 40,000 to 1.46lakhs.

Yes many colleges provide the option of  paying the fees in installments.For admission in this course you can give entrance exams like-

1)AIIMS entrance exam

2)JIPMER Exam

3)PGIMER Exam

4)IGNOU Opennet

5)UHS Nursing Entrance Exam

6)Uttarakhand entrance exam

7)BHU entrance exam.

To know more details about the eligibility of the above entrance exams and scope of the course you can visit this link- https://www.careers360.com/courses/general-nursing-and-midwifery-course