If you don’t know what you’re doing wrong in interviews, you can’t fix it.
Assuming you know about turning up on time, being friendly & polite to the receptionist, following the instructions and combing your hair, there are less obvious things to consider.
Even well qualified job seekers can be pipped at the post because another candidate has offered something unique over and above. Lack of awareness is probably the most common reason why an organisation doesn’t proceed with a candidate. This can manifest itself in many ways –overstating one’s ability or experience, poor reading of the interviewing decision criteria, lacking rapport with the interviewers, unconvincing impressions around understanding the challenges and commitment to the organisation’s purpose.