Software Engineering

To become a software engineer, you need to pursue Diploma in software engineering after class 10th and then pursue Bachelors in software engineering to enhance your knowledge. Or you can also pursue BCA degree after PUC and become a software engineer.

Some universities consider Diploma as equal to 12th but some demand PUC only to give admission to degree courses.

If you had Maths in class 12th, then you are eligible for MCA. You can do IT courses. Indian IT companies prefer B.Tech CSE/B.Tech IT/MCA/M.Sc IT graduates for software roles. You may face challenges in finding job with IT courses and certifications.

Your question is not appropriate. Kindly, re-frame it.

Students who have cleared 10+2 with 50% marks and Physics, Chemistry and Mathematics as main subjects are eligible for applying for admission to B.Tech Software Engineering.

You should have passed class 12th with good percentage.

I am really happy that you have broached a good query. Admissions to any engineering college these days is only via some or the other entrance test. Also, trend of students is bid for IT or CSE. Thus, who ever score very well in entrance exam, only have good chance of getting admission in this branch.

No, it's not necessary to pursue B.Sc Computer Science from an IIT. Check out the link below for top B.Sc Computer Science colleges in India:
https://www.shiksha.com/science/articles/top-10-bsc-msc-colleges-in-india-blogId-13473.

You can find all the available course here
https://www.google.com/amp/s/www.shiksha.com/b-tech/amp/bitsat-exam