The Alberta Learning Website has a lot of free and useful information on Math 30. Alberta Education keeps an archive of the Math 30 diploma examinations from the past few years, along with other useful information and documents regarding diploma exams.
Note that most of the documents at this site are in Adobe Acrobat format. Follow this link to download Adobe Acrobat Reader for free.
Here is a list of the important documents you can find at the Alberta Education site: