Hello
The eligiblity criteria for admission to B.Sc Computer Science is that the candidate should have studied Mathematics at class XII level.
The admissions are based on merit or university level entrance exams.
Top colleges for B.Sc Computer Science are

• Loyola College Chennai
• St. Xavier's College Mumbai
• Jain University Bangalore
• Christ University Bangalore
• Chandigarh University
• The Oxford College of Science

You need a minimum of 50% marks to be eligible for this course. Admission will based on score of entrance exams.

Good luck