It will be overwhelming to be significantly prepared, even for a passionate CS expert. But a passionate CS expert can still get an offer at these places, even

It will be overwhelming to be significantly prepared, even for a passionate CS expert. But a passionate CS expert can still get an offer at these places, even without preparing significantly. This is because (many) interviews are designed to test a breadth of fundamental knowledge, up to pushing the candidate to their limits, and even the limit of the state of the art. As an analogy, just because a Corvette doesn't perform like a Ferrari doesn't mean it's a bad car. It could still be chosen. Perhaps chosen based on some other soft qualities. Or because the Ferrari is too expensive. Don't worry so much. Keep preparing by focusing on small bite size chunks you can master. Then attempt some interviews.