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I registered for the December LSAT. There are some schools I applied to over a week ago and have already gone complete at. Should I notify all of them (or just the reach schools) that I am retaking or will LSAC notify them?

There are some schools I will be applying to soon. Should I let them know I am retaking (and if so, how?) or will LSAC?

Depends on if you want them to consider your application with the old score or the new score.

I will want the reach schools to consider my new score..