Hi!
Sorry to hear that, I'm sure you will do better next time!
When I studied for this exam, I read one book, watched various of videos, took an online course and performed plenty tests in my lab.
The book I bought was the following:
Exam Ref 70-411 Administering Windows Server 2012 R2 (MCSA): Administering Windows Server 2012 R2
There are plenty of books but I found this one quite useful.
Other material that I used was various videos (you'll find plenty on YouTube), one example:
I also took the following IT training from CBTNuggets, I found it very useful:
Then I set up a configured a lot in my lab, for me at least I learn a lot by doing and I find it very helpful before taking exams.
Hope this is useful!
Best regards,
Leon
Blog:
https://thesystemcenterblog.com
LinkedIn: