After the previous Second Shot promotion ended, about six months passed before they started it again. Microsoft may do another, but there's no guarantee.

My recomendatation would be to buy a second shot voucher and schedule the first attempt for no later than 6 weeks before the voucher expires. Sure, you may not pass the first attempt, but you will walk out with a much better idea of where you should focus your study. The first attempt at a Second Shot is the best legal way to prepare (for the second attempt) short of several years at a job that just happened to require frequent use of all features asked about in the exam.