Have you given Jee Main exam as this is one of the most important exam to get admission in B.Tech?

HI, For engineering you will have to apply for various Btech entrances like JEE MAINS, BITSAT, JEE Advance, SRM , VIT etc.

For these exams you will have to start applying after 12th.

Also you can let me know incase you are asking for any specific course/exam.