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Many employers believe that straight A students have ego of the size of a mountain and there are living proofs for that. They expect more due to their heightened ego which is somewhat justified but not always.
You can easily prove your employer that you have taken your career quite seriously and changed your behavior for better, you can have an upper hand. Nobody can be perfect forever, and so if you can be imperfect during some other time (college) and learn from your mistakes, chances are you will be much more valuable and mature during work.
