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So I'm taking the September LSAT and I have the choice to send my scores to schools? My question is do I send it to schools, what if I under perform? Does it have any disadvantages to admission if I decide to retake?

Thanks

That choice (if I understand the one you're talking about) is just referring to whether or not you want schools to know your LSAT score for purposes of sending you publicity materials and fee waivers. Every school you apply to will always get all your LSAT scores.

But no, there is no drawback to retaking for a higher score. That's never a bad idea.