Hello Sridhar,

One cannot say that out of two approaches one is correct while the other is wrong. If somebody thinks that he can do polytechnic for 3 years and then directly pursue S.E compter engineering, it as right as somebody who wishes to pursue intermediate level examinations and then join an engineering college. The most important aspect to be a software engineeris how clear you are with the basic concepts of programming. What is seen in an interview for a developer's job or a software engineer's job is your understading of the basic concepts and not how you have progressed till B.E. 

Hope this clears your doubt!

Thank you!