Nursing Eligibility

Yes, with the above percentage admission is possible, but in very less number of colleges. As the aggregate is low and most colleges have eligibility with 55% marks and above, generally, so you might not get a choice for a very good college but there's a chance you can find an average one.
In Aliah University, for admission in B.Sc nursing, a minimum of 45% marks is required in class 12th. Kindly check out the link below.
https://www.shiksha.com/nursing/course/amp/b-sc-in-nursing-aliah-university-city-campus-park-circus-kolkata-296566

Please check for your eligibility to apply for B.Sc Nursing at this institute from the link provided below:
https://www.shiksha.com/nursing/course/b-sc-in-nursing-christian-college-k-r-puram-bangalore-302947

No. Biology is must in 12th for the B.Sc nursing course as it requires knowledge in basic biology. So You can not pursue the said subject.

So what do you want to know about? Please mention your query.
Thanks.

Hello dear,
Eligibility for B.Sc Nursing:
The minimum age for admission shall be 17 years on 31st December of the year, in which admission is sought. Minimum education: 10+2 class passed with Science (PCB) & English Core/English Elective with aggregate of 45% marks from recognized board under AISSCE/CBSE/ICSE/SSCE/HSCE or other equivalent board.

Admission is based on the marks obtained in Entrance Test. Eligible candidates need to appear for Entrance Test conducted by the Armed Forces Medical College. For further details regarding this course please refer to the link provided below:
https://www.shiksha.com/nursing/course/msc-nursing-armed-forces-medical-college-afmc-wanowrie-pune-177654

No, you can't. Zoology and nursing are totally different fields.