This question tests how composed you remain despite the stress and assesses how developed your self-awareness is. It also provides an opportunity to be more thorough in your interview performance by circling back to any prior questions you wish you had answered differently or more thoroughly. Focus on one's self-growth and wielding a desire to put your all in speaks to your emotional maturity and a strong work ethic. Don't ask them for their opinion of your performance. Just be honest and remain confident.