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I'd actually recommend saying that your friend John wants to become a doctor (telling your own story in the third person)
The reason is that one of the most common mistakes examiners hear is students forgetting the third-person singular -s. If you talk about yourself, you miss an opportunity to demonstrate that you can use this grammar accurately.
So, instead of saying, "I want to become a doctor," simply invent a hypothetical friend called John and tell exactly the same story
Use the same ideas and vocabulary, but this time you'll also be showing the examiner that you can consistently control the third-person singular😁