The LSAT is offered four times a year: June, September, December, and February. Three testing dates are on Saturday mornings. If you observe a Saturday Sabbath, then you can register for testing on one Monday in June, providing you present a letter on official letterhead that is signed by your minister, rabbi, or recognized officiant, stating this is a necessary religious observance. LSAC keeps this letter on file to ensure that you cannot switch to a future Saturday test date.
View the test dates and locations at http://www.lsac.org/jd/lsat/test-dates-deadlines. Candidates register for their preferred LSAT date and location by phone, online, fax or surface mail. Register for your LSAT at least six weeks before your preferred test date to improve your chance of obtaining your first choice of location. Early registration also ensures you’ll avoid a late fee. Enclose the letter from your religious leader with your registration form, if applicable.