hi,

usually the most colleges criteria to admission in b.sc in computer science is candidates must have studied physics, chemistry and mathematics as compulsory subject in 12th course. since you are from commerce background you would not eligible for b.sc course in computer science. however you may go for b.com (//b.com) course in computer science, which is mainly focus in the area of  of commerce with application of computer science. some of the college in India which offers b.com (//b.com) with computer science is as follows:

Indira Gandhi College of Arts and Science - Kerela

Devi Ahilya Vishwavidyalaya - Madhya Pradesh

Maharaja Arts and Science College,  Tamil Nadu

Osmania College - Autonomous - Andhra Pradesh

Punjabi University - Punjab