Hello,
St.Stephens College of Delhi University provide many courses of BA and B.Sc. The cut-off for different courses of 2018 are not beyond 94%. In most courses, they ask for 97% especially arts. But if you have any reservation, you may get into the college. Otherwise the admission to St.Stephens can be considered as a difficult one.
As you have done Class 12 Science with PCMB, the B.Sc courses have cut-off from 97-94%, missing yours by about 1%. You may consider the college during admission because its possible that this year's cut-off may change. It depends on other students also who apply there. Cut-off of 97% is for Physics.
You can check for detailed cut-off of courses at https://www.ststephens.edu/cutoffs-2018/
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