I want to make my career in cyber security. Is it okay to do BTech with Computer Science?

Practically all ethical hacking programs require students to have a Bachelor's degree in computer Science or a closely related field. Those who are well-versed in OSs, networks, and databases are an exception to the norm. Many prestigious universities offer PGP programs, too. Companies of all sizes

Yes. But over you have to focus on your skills which you will not get in collegesyou have to do it by your self.