Hello Mahmoud and welcome to CLN--The CCIE DC exam is currently on v2.1, and the latest string on study materials for the exam is Is there any official Certification guide for CCIE DC v2.1?
Additionally, the content update for v2.1 can be found here. CCIE Data Center Written and Lab Content Updates v2.1. CLN has a list of recommended study materials here. CCIE Data Center
Hope this helps. MM