After failing the first time with a 550, I passed 70-462 with an 850.

The test was pretty hard, but manageable. I don't have a lot of SQL Server experience besides basic SELECT queries and JOINS, (so yes there is hope for beginners!). I had about 50 questions with 6-8 drag and drops. I used the following materials to study:
1. Read the Entire Joes2Pros Series to get a foundation in SQL Server 2012 + T-SQL Fundamentals
2. Read the book Professional Microsoft SQL Server 2012 Administration
3. Read the 70-462 Microsoft Press book (I know some people don't like it, but I thought it was pretty good!)
4. Used Measureup.com to practice questions