Holly Dickson (of MS Learning) just posted a nice blog where you can read how to attend the upcoming Windows 10 exam for free! The only prerequisite is that you have earned the MCSA Windows 8 certification.
Earn your Microsoft Certified Solutions Associate (MCSA) certification in Windows 8 between February 15, 2015, and May 31, 2015, and you’ll be eligible to take a Windows 10 exam (Exam 697) for free when it’s published later this year! The Windows 8 MCSA covers Windows 8.1, so you’ll be current and ready to move to Windows 10.
Here’s what you need to do:
Step 1: Prove what you know. Earn your MCSA: Windows 8 certification by choosing one of the paths below:
Step 2: When the Windows 10 Exam 70-697 is available (expected in the second half of 2015), sign in to https://www.microsoft.com/learning and register for the exam for free.
Source : BorntoLearn