Hi!
The MCSA for Windows 8 requires you to pass exams: 70-687 and 70-688.
Here they are:
http://www.microsoft.com/learning/en-us/exam-70-687.aspx
http://www.microsoft.com/learning/en-us/exam-70-688.aspx
Each of these exams is going to require dedicated studying and practice with Windows 8.
Here is the web page that describes this title.
http://www.microsoft.com/learning/en-us/mcsa-windows-8-certification.aspx
On this page (under Resources) is a great list of study materials for these exams. They include books, practice exams, the exam wiki sites.
For books, check the reviews on Amazon to learn what others feel about them. This is often the fastest way to prepare.
Here is one of Microsoft free training sites, offering training on Windows 8:
http://www.microsoftvirtualacademy.com
As well, be sure to register your exam with the free Second Shot program. It will allow you to retake a failed exam for free - once. Get your code here:
http://www.microsoft.com/learning/en-us/second-shot.aspx
Good luck!
Best wishes, Davin Mickelson