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Does anyone know how grad school personal statement differs from law school personal statement?
I am trying to apply to professional grad school for policy studies(i.e. SIPA at Columbia) and was wondering how it differs.

Any recommendable website akin to TLS?

I find TLS to be quite helpful.

Thanks in advance.

Having wirtten both, I'm not sure that they really do. Follow the prompt in the application. If you have questions, contact the admissions office for the graduate college. They're there to help.