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Let an adult read it before you send it for grammatical errors and to let you know if it flows. They should not "correct" it or write it for you.
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This is important.
That adult CAN be a parent, but only if the relationship works for that. If not, find a teacher or trusted family friend.
My kid let me look over his essays, and I would point out things like “I’m not following your logic here” or “you’re over-using that adjective” or “consider how this might read to someone who doesn’t know you well” or “consider including more specifics” but beyond that he was on his own – for better or for worse.