Hello Rohit,
If you wish to appear for engineering after your class 12th, there are a number of entrance exams you can give. Since you're still in school, I would suggest you to start your preparation of the engineering entrance you want to give as it will require a lot of hard work.You can check out the link given below to get more information about the entrance exams, the eligibility criteria, syllabus etc. Good Luck!
https://engineering.careers360.com/exams
Helloo...
If you are appearing for class12 exams now and want to do b.tech in computer science or want to become a computer engineer you should join in a engineering College or University.
You should write entrance exams to get the seat.
For example if you want to do Engineering in Government colleges you should write the entrance exam of that state .
Hope you will understand..
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