You will have to fulfil the below criteria if you wish to pursue B.Sc from AMU through its entrance -

A candidate to have passed the Senior Secondary School Examination with an aggregate of 55 % in English, Physics, Chemistry and either Biology or Mathematics. Also, Mathematics is compulsory for those who desire a bachelor degree in any among Physics, Mathematics, Statistics and Computer Applications.

And the application window is not yet open but tentatively forms should be there in this month (Feb) only.

Good Luck!!!