sat stand by

可以..你可以当时去考场报名

以下是说明
If you miss the late registration deadline, you may be able to take the SAT as a standby. Test centers accept standbys in the order of their arrival, only if they have enough space, testing materials, and staff—so there is no guarantee that you'll be admitted to the test. You will not be admitted until all preregistered test-takers have been seated.

方法
To be considered for standby testing, please be present at the test center on test day before 7:45 a.m. You must include payment of a standby feel in addition to the regular fee for the test or tests you wish to take.
To register as a standby, be sure to:

Fill out the Registration Form completely and be sure to fill in the oval for the standby fee in item 18; otherwise, your scores will be delayed.
Include payment for the test fee, plus the additional standby fee. Payment must be in the form of a check, money order, or credit card (American Express, Discover