Even the best preparation can sometimes not be enough to achieve the results you wanted. There are things that are out of your control. Other times, you know you could have done better in certain areas. Reflection is a key part of moving forward.
The honest self reflection is what’s important. We could flatter ourselves with all the praise yet it won’t make us better or help us improve. If we are genuinely looking to improve, we have to cut the bullshit and be honest with ourselves. What you tell yourself will most likely come out to be true. As the quote goes, whether you think you can or think you can’t, you’re right.