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I will be applying before my December LSAT score is released (it's the only LSAT I ever took; I don't have any score in record), and I hope to make sure that there's not going to be a problem with applying with the slot for "LSAT Score" not filled out in the applications..
And if I do apply before my score is released, does LSAC automatically send schools my LSAT score once it's released or do I need to request somehow?
Thank you in advance!

you can apply. Depending on how many pratice tests you took, and how you were scoring on them, you should take that average and deduct 3 points ( and thats your estimated score range). You dont have to tell the schools of your score, LSAC should inform them of your score ( at least they did when I applied). Just write DEC. '12 LSAT and you are all set. But if you do end up retaking and reapplying, then you will hae wasted your money and time.