 As important as taking the mock is to assess your performance and to see how you've actually done and what are the areas you can improve and assess yourself on these four parameters. 1. The content. Listen to what you're saying, the words that you're using and assess the content of your answers. 2. Parameter. Fluency. How was your speech? How did you communicate in the mock interview? 3. Pace of speaking. How was your pace of speaking? Your pace of speaking has to be somewhere in the middle, not too fast that the visa officer misses it and obviously not too slow that you're not even able to finish what you have prepared. And lastly, but most important, eye contact and confidence. The USA visa process is a completely interview and interaction based process, documents are very rarely asked. So how you present yourself, how you maintain the eye contact and interact with the visa officer is a big part of the game. And this is going to give you an assessment of how you have performed and what are the areas you need to improve on.