Hello,

I will make you aware of the courses related to Computer Science, Here you go-

1. B.Sc (Bachelor's of Science) Computer Science-

This is a three years Undergraduate Programme related to Computer Science field. To pursue this course, a candidate must have studied Physics Chemistry and Mathematics as their major Subjects. To be eligible for this course you must have scored minimum 50-60 percent (depending on the University) in 12th.

2. BCA (Bachelor's of Computer Application)-

Like B.Sc Computer Science, This is also a three years Undergraduate Programme. In order to be eligible for BCA Programme, a Candidate must have Studied Mathematics as one the Subjects even if the Candidate has passed 12th from a commerce background, only Mathematics as one of the Subjects is mandatory. You must have scored minimum 45-50 percent in 12th (depending on the University)

3. B.Tech (Bachelor's of Technology) From CSE (Computer Science and Engineering)-

Unlike B.Sc Computer Science and BCA, this is a four years Undergraduate Engineering Course. And in order to be eligible for this, candidate must have studied Physics Chemistry and Mathematics as their major Subjects. Since this is an engineering course, you must have appear in some National level or University level entrance exams like JEE MAINS, JEE ADVANCED, Amity JEE, SRM JEE, VITEEE to take  admission into this course.

Good Luck.