Preparing for an interview by yourself is a start, but practicing interview questions with a friend will really help you see where you can improve. (blog.simplyhired.com)
Here's a list of practice interview questions for a variety of occupations, types of jobs and types of interviews to review. (thebalance.com)
Practice interview questions in the mirror, and try to keep those habits under control as you're speaking. (thejobnetwork.com)