Patna Women's College is considered the best College of Patna for girls. It offers several undergraduate and postgraduate courses. The minimum eligibility criteria is that the students must have scored 50 per cent. The admission is through entrance test.
For Bachelor of Science in Mathematics,the entrance test will include Aptitude and General Knowledge and a section of Mathematics and Statistics. The questions will be mostly from your 10+2 syllabus,they will checking how much knowledge you have grasped throughout your high school.
Hope this helps.