Hi,
There are numerous state and national level exams held each year for those seeking a B. Tech in CSE (or any other branch).

Though registration for most of the major exams is concluded there are still a few options remaining. I will list out the popular exams for B.Tech here:

1. JEE: Joint Entrance Examination is one of the most competitive exams for admissions in NITs/IITs and several other public and private colleges for B.Tech. It has two levels first is JEE Mains and then it is followed by JEE Advanced. It is conducted twice a year; the first session was conducted earlier this year and the registration for the second session is also concluded on 30th June. So, you can apply in the first session next year.
2. BITSAT: BITSAT is another national-level exam and is a Computer-based online test for Admissions to BITS Pilani Campuses in Pilani, Goa, and Hyderabad. It is conducted twice a year and the registration for the second round is open from July 4 to 20, 2022.
3. COMEDK: It is a common entrance exam for B.Tech colleges in Karnataka and is open to students all over India. It was held in June.
4. WBJEE: West Bengal Joint Entrance Examination is conducted for admission to several private and public colleges. WBJEE 22 was held on April 30.

Apart from the above-mentioned exams, there are several other exams like VITEEE for Vellore Institute of Technology, KEAM, IPU CET, and other state-level exams.