1. Let's analyze why you might have changed your answer at the last minute. 2. Often, this happens due to second-guessing yourself, which is a common cognitive bias called **doubt** or **overthinking**. 3. Another reason might be the pressure of the moment, causing you to question your initial reasoning even though it was correct. 4. It's important to trust your first well-thought-out answer, especially if you arrived at it using careful calculation or logic. 5. To improve, practice confidence in problem-solving and review your work calmly before making a final decision. In summary, last-minute changes often stem from doubt, not from actual errors in the first answer.