If i failed in physics in class 12th but oassed away by best of 5, can i be able to join a college for bsc taking maths as my main subject?
You should not think of that.You have to pass all 5 subjects if you want admission in any course like bsc.
Different colleges have different eligibility criteria.So you should checkout the eligibility criteria of that college where you want admission.
Good luck.

If u get fail in any subject not any collage jo to prefer you as your student