Is mca is good option after bsc math to become software engineer or go for btech lateral entry mca in nit is good ?

Here’s a clear analysis and comparison of your options for becoming a software engineer after BSc Math:

If you have a BSc in math and wish to work as a software engineer, the MCA is usually the easiest and most efficient route. Additional benefits might be available if you can obtain a BTech lateral entry in computer science from a reputable institution, although this is less usual and more restrictive. Choose between specialised IT skills and a more general engineering background, taking into account your access to lateral entry alternatives.