Hello aspirant

Board offers many choices but most commonly opted for optional subject with Science or biology are Medical - psychology, Biotechnology , Economics, home Science, fine art, physical education.

Non medical - computer science, Economics, physical education, Drawing, fine arts, psychology

Check that without your school. Because different schools have different set of subjects offered.

Usually it is

1. Physics, chemistry, biology and mathematics. The students taking this have a wide variety of college courses to opt from
2. Physics, chemistry, mathematics and computer science. This is for students who want to opt for engineering mainly.
3. Biology, physics, chemistry, informatics. This is for students who want to pursue medicine.

Again, the combo is different for different schools.