I have done my HSC with 73% (without maths). Is it possible to get admission for B.Sc. IT in KJ Somaiya College?

I will suggest you to visit the college website for the more details. Also, try to contact with the college.

Maths is compulsory for B.Sc. IT.

Maths is needed in order to get admission for B.Sc. IT in almost most of the colleges. You can visit the college once, talk with the principal that you are extremely interested and see if there is any provision for you. All the best.