Hello Shubham,

I regret to inform you that with Biology in 10+2 you are not eligible for an officer  which is a technical post.However, you can become a doctor in Armed force, for this you need to appear for NEET and get good rank.The admission done under AFMC.You can also pursue B.sc Nursing in military as you have studied Biology in 10+2.You can only become an officer(technical post) if you have studied Mathematics, Physics and Chemistry in 10+2.

I hope this is helpful to you.