Which is the best course among BBA and B.Sc that can be done after HS?

It depends on your interests and the field you want to choose: Science or business. If you are interested in business, go for the BBA if you are more interested in Science, go for the B.Sc. In computer Science, it has a good scope in B.Sc. The BBA doesn't really have a wide range. B.Sc. Computer Sci

You can go with any one of these, but if you are good with your basics of Science, go with B.Sc. It will be beneficial for future.

It depends on your interest, and which field you want to opt for: science or corporate. If you have interest in corporate, go for BBA and if you like science more, opt for B.Sc. In computer science, it really has a good scope in B.Sc. BBA hasn't really got a good scope. You need to do MBA from top-n

B.Sc Computer Science and Bachelors and Computer Application will help you get job as good as engineers.