To join any B.Tech colleges or any Universities, research different colleges and universities offering B.Tech programs. Make a list of the ones that align with your preferences and academic goals.

Each University or college will have its own set of eligibility criteria for B.Tech admissions. So make sure to meet their eligibility requirements.

Appear for the Entrance Exam if required. Many colleges and universities require candidates to appear for Entrance Exams like JEEMains, JEE Advanced, BITSAT, SRMJEE,VITEEE,etc for admission to B.Tech programs.

Once you've identified the college you want, apply by filling the application form as per instructions before deadline.

Based on your performance and other selection criteria specified by the institution, you'll be notified whether you've been selected for admission.

Upon accepting the admission offer, attend the required oriented session.

Once you've completed all the admission formalities you can start your B.Tech program at the chosen college.