To what date this beta exam will be available to pass ?
The beta exam is open to everyone (the non re:Invent attendees) from Dec 3, 2016 – Jan 31, 2017.
Results are out by March 2017. If one fails to be certified, AWS provides a voucher (valid for 1 yr) for a free retake. The Gurus talk about here (~21:00) : https://www.youtube.com/watch?v=-AQ7JAJXBis