Hello Kajal,

There is no limit for number of attempts but there is an age criteria which you may have to fulfill, the following is the eligibility criteria

• The candidate must be female
• Citizen of India
• Born in between 1st October 1994 and 30th September 2002
• Candidates must have atleast 50% aggregate in 10+2 in physics, chemistry biology (botany and zoology) and English in first attempt from a recognised board.

As long as you come under the specified age criteria you can appear for  B.sc nursing in Indian army.

I hope this is helpful to you.