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<p>Your CR and Math are fine. I would re-take to get the writing to at least a 680,690 or 700+, and if possible, make at least one of the three scores go towards the 75th percentile. So something like 780 Math, 670 Reading, 700 Writing. </p>
<p>And as for ECs, they are definitely VERY IMPORTANT. You get so many people with in-range test scores, that to distinguish yourself, ECs will play a significant roles (as seen through list, essays). ECs are mostly about dedication, leadership and impact, more so than quantity.</p>