Which entrance exam should I take for pursuing B.Tech in electronics engineering?

You can do it in many ways. The first choice is of JEE Mains or any another exam conducted by the state. If you would like to join a university, you can take their exam and if you get a good score in the HSC, you can pursue engineering from the same.

Dear Sazid, You need to appear for JEE Mains exam to get admission in a good college. Moreover, some deemed universities conduct their own entrance exam every year. You can also take that exam and get a college. For example, IP University-Delhi, LPU, Chandigarh University, PEC-Punjab, Thapar Unive

You have to take IIT-JEE exam to pursue B.Tech in electronics engineering. Also, there are several other exams conducted by the private universities like IP University, Jamia Millia Islamia and Manav Rachna. Apart from this, you can also take the entrance exam conducted by UPTU.