If you think you are qualified to apply for Cambridge, you shouldn't let anyone but yourself to handle the issue.PS is just the basic but imperative part of your application by which your academic and linguistic capabilities are partially assessed. Try to rethink why it must be Cambridge and why it must be you to be enrolled by her. You will know the answer at last.

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Still, it should be your own answer rather than a copy of others. If she's not that attractive, why should you bother?