Hello,

To be eligible for b.Tech, a Candidate must have Studied Physics, Chemistry Mathematics and English as their major Subjects. Thr Candidates must have scored 50 percent in the these Subjects. Five percent relaxation has been granted to reserved category candidates like SC ST. So, if you have not studied these Subjects you are not eligible for B.Tech. But you can do one thing, pass class 12th with these Subjects from CBSE or State board.

After that you can appear for entrance exams like JEE MAINS. Apart from JEE MAINS, you can sit for entrance exams of other Universities too like VITEEE (Vellore Institute of Technology Engineering Entrance Exam) SRM JEE (SRM Joint Entrance Exam). These Engineering Institutions does not offer admission into B.Tech Courses on the basis of JEE MAINS score, that's why they conduct their entrance exams to offer Admission.

To know more about JEE MAINS, please go through this link

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-eligibility-criteria/amp

Good Luck.