hey,

to become a soft ware engineer, after 10+2 score you may join either of the course, bachelor of technology in computer science or information technology or bachelor in computer application (bca) or bsc in computer science.

to get admission in btech you need to appear in engineering competitive exam. see some companies need mca certificed after bca or msc degreee holder after bsc to recruit as a software engineer.now a days other engineering degree holders are also joining software feild due to growing market of IT industry.

you may follow the link to know about engineering entrance exam.

https://engineering.careers360.com/exams