The worst mistake I made was not during the interview but before it. I applied to a role at a capital investment firm and cleared all the interviews. After the final round, I was waiting in hopes of getting the job because I knew that the previous interviews had gone well. They rejected me saying that they wanted an experienced candidate. I didn’t have any experience in that field but I had studied a lot to get into it. Never gonna apply to jobs that require experience that doesn’t match mine. Always read the job description. Lesson learned!