When getting a job in software engineering, Is it normal to fail the first couple of test?

Not sure if this is the best place but, I’ve been trying to get a job as a programmer but and have managed to get a couple of interviews. Problem is once I come into the tests I get nervous, clueless to some of the questions and, as of right now, fail the tests. Is this normal to just mess up at first couple or should I be more concerned?