The essay you are being told to write would be descriptive in nature. Important points to note while writing or making an outline for this essay are;
The introductory part of this essay should tell us about the career you had in high school. You could have worked as a server in a restaurant, a barista, a receptionist, etc.
The next paragraph should highlight the opportunity or challenge you had while working.
The following paragraph should explain the lessons you learned from the experience.
In the concluding paragraph, explain how the lesson you learned could help you in the future.
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