Also doing the same currently. Recently passed 70-410, resources used was CBT Nuggets for 2012 R2, also the Wiley book:
http://eu.wiley.com/WileyCDA/WileyTitle/productCd-1118544072,miniSiteCd-SYBEX.html
Oh and labs, labs, labs, they really do help.
And then lastly, to get an idea of what to expect, i ran through a couple of practice tests\dumps, actually helped to troubleshoot the questions better in the exam. (for example, they love to ask what you have to do FIRST before this and that eg powershell cmdlets for installing AD binaries and then setting up the first DC in your forest in server core).
In the exam, the hammered me with Virtualization, DNS, DHCP, IPV6 and Group Policy. Oh and lets not forget powershell
Take a look at techexams, a lot of threads relating to the 70- exams.
And for powershell, this actually helped:
http://mcsa-70-410.blogspot.co.za/2013/07/powershell-commands-for-mcsa-70-410.html
Good luck bud, time given to complete the exam is actually more than enough.