People w/ Extra Time Accommodations

Is there a way to practice the full-length SAT tests with extra time accommodations on the Khan Academy website? I need the extra time to see how I will perform on the actual test because without the extra time, I can't finish the test within the time given. If this isn't a thing, I think it would be a really good update to make, and in the update, add all the accommodations that can be used on the SAT. This would be very helpful. Thank you.