Career

Hello Subrata,
To be able to become a software engineer, you need to have PCM (Physics, Chemistry and Mathematics) combination in your 12th standard. After you 12th board examinations are ovee, you need to appear for various entrance examinations.
I would suggest you to appear for IIT JEE and AIEEE. These two entrance examinations provide admissions to IITs/ NITs and other government colleges, which are cost-effective.
I would also suggest you to appear for individual state examinations (OJEE in Odisha, EAMCET in Andhra Pradesh/Telangana, COMEDK in Karnataka, etc.). These exams also guarantee you good colleges and serve as a backup in case things don't end up the way you've planned for IIT/ AIEEE.
Every state has its own share of good engineering colleges. So, don't underestimate or overlook them. They can prove to be vital. The more the entrance examinations you appear for, the more the options you will have for choosing colleges.
Certain private colleges like SRM, KIIT (Odisha), GITAM (Vishakhapatnam) and ITER (Odisha) conduct their own entrance examinations. You can opt for these as well.
After the results of those entrance examinations are announced, if you have a valid score and rank, you can attend the counselling procedure for the respective entrance examination. During the counselling procedure, you can select a college of your choice and the branch of engineering you wish to opt for (depending on availability). Here you can choose Software Engineering or Computer Engineering or Information Technology. All the three courses mentioned have more or less the same syllabus.
I hope it helps. If so, kindly, upvote this answer. If you've any further questions, kindly revert.

Apart from CSE, you can look for these streams-
Electronics and communication - In this, you will learn all about digital electronics and logic design, fundamentals of communication engineering, electronic circuits, signals and systems, power electronics, applied electromagnetic theory, integrated circuits, VLSI etc. Go for this engineering specialisation if you have a strong base (and interest) in calculus and physics (semiconductors etc.). The telecommunications industry and mobile development industry have been progressing by leaps and bounds in the last few years and would offer excellent opportunities to graduates.
Electronics and electrical - Transmission and generation of electrical power, electrical circuit design, electronics, instrumentation, control systems, etc. government sectors has more opportunities in this field. It is an evergreen field.
Mechanical engineering - Another evergreen field, there will always be opportunities here, despite varying market trends. It is one of the oldest and most demanding branch of engineering and therefore one of the broadest. As a mechanical engineer, you will get to design, analysis, manufacture and maintain anything that moves.
Civil engineering - This branch is looking up these days mainly due to the numerous infrastructure projects that are in the pipeline for India. It is a challenging profile but immensely satisfying as well. Also, with the green way of living gaining popularity across the world, the role of a civil engineer often overlaps with that of an environment engineer as he needs to plan his projects in an environment-friendly manner.
Apart from these, chemical engineering and bio-technology are other upcoming branches which are attracting students with the advancement in the technology.