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I just took the December LSAT and scores will be out January so I want everything to be ready to be sent out. Do I need to have my 2nd semester transcripts sent in to LSAC? Also, should I send in applications a few days before the January 10th release date?

You don't have to update LSAC with recent transcripts unless you want to. If your GPA went up, it is usually a good idea.