I just received an email from a mcat tutor. he suggested me not to practice for the writing portion since most med school wont take it seriously. as long as I do not get M,N, or O, I will be fine.
WS only matters for Canadian medical schools. You'd actually be fine with an M in writing, though I'd pay special attention to grammar and spelling mistakes in your applications. For US schools, as long as you don't have J or K, and sometimes an L, you're fine.
Be aware that some upper tier med schools actually count the writing score into your total score. An interesting tidbit I learned from a higher up recently.
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