hi,

see computer science is a subject where you need to self study more than attending classroom or coaching classes. to become a professional you can not solely depends on only degree curriculum . you need to learn by your self on many new technologies and programming language. see you can be a software engineer after completing msc in computer science, but the road is really long compare to btech in computer science. btech course is made more for technical work where in msc there is many thesis work included. if you get into a good engineering college where placement is really good you can get into IT industry after completing 4 years of graduation course. on the other hand most of the colleges there is no placement for msc students, and this needs 5 years to get job ready.

but before joining b.tech in any college please inquire about the colleges as much as possible. because you will face serious problem if the placement is not good in your college and its really difficult to job hunt as a fresher after college.