Hi there,
It is good that you want to opt for Computer science engineering after class 12th.
Right now the scope in IT sector is at boom. Various companies are hiring freshers with a decent package and also the it sector has become a success sector as compared to others.
Coming to your point of how to apply for CSE after class 12th, you can apply for JEE mains examination which is held on national level for admissions into reputed institutes of india such as NITS, IIITS etc.
Prepare for entrances exams for Btech course and do well. You must understand that a good score will let you get a cse seat jn a college since the demand for CSE branch is very high.
Access this link for better reach: https://www.careers360.com/courses/b-tech-bachelor-of-technology
Hope this information will help you.
Thank you and good luck for the future.
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