If you are studying or planning on upgrading to Extra be aware the current test questions are expiring June 30, 2016.
http://www.arrl.org/upgrading-to-an-extra-license

The next set of study questions are already published if you can’t take your test in time.

3rd Public Domain Release of 2016-2020 Extra Class Question Pool
They can be found at http://www.ncvec.org/page.php?id=365