People should focus on which area while preparing for interview and how to overcome this?

Interviews can either make you or break you. It is important to be as professional but as yourself as you can be. It is important to know your strengths and focus on these strengths, highlight them if you must. Also, when going for an interview or applying for a job for that matter, it's important to know as much about that company as possible, know what you're getting yourself into, what is expected of you, impress them by bringing about facts about the company, talk about how you'd fit it with their work environment, or how much you admire what they stand for. The company ethos are practically the tools served on a silver platter. Best of luck to you.