Which is the best computer course for an arts background student?

Depends on your taste and aptitude. If you have creativity and artistic skills like drawing, paintings,imaginations, Graphic Designing, Multimedia & Animation is the best choices for you. There are some basic certifications or short term diploma courses which helps you to get a job easily. Ie :- C

Basic computer knowledge is required. Then multimedia, animation..... if u choose Math (only one subject as combined)then u can also choose BCA from distance.

Computer courses are not related to arts in very first place. But if we relate it to arts then courses like multimedia, animation, graphic designing is all computer based professional program. All the Best !