All applications should be typed. If possible, all of your applications should be completed and mailed no later than early December. If you complete them earlier, then by all means, send them out as soon as they are ready. Before actually mailing the applications, you should make photocopies of the completed application for each school in the event that there is a problem with the mail. Keep in mind that it is your responsibility to see to it that the law schools to which you have applied have indeed received all necessary information.
Most law schools provide a number of update-notification postcards in their application materials.
Complete all of them with your mailing address, affix proper postage for return, and enclose them with your application. If you do not receive this card, call the admissions office and inquire as to whether your file is complete. Once your completed applications are reviewed, there isn't very much you can do until you hear from the law schools with their decision. If your grades from the fall semester of your senior year were very good, you may want to send an official transcript to the law schools to update them on your academic progress. If your cumulative GPA went down as a result of your performance during the fall of your senior year, do not send an updated transcript unless you are required to do so.