Need to buy SchweserNotes of 2013 version in addtion to 2012 version?

I would like to know whether I need to buy SchweserNotes of 2013 version in addtion to 2012 version.

I worked with 2012 version but failed to pass level 3 in 2012 so I need to take level 3 this year. However, I am wondering whether 2013 version of SchweserNotes is different from 2012 version.