Hi Ashley,
I took the exam in December, and reviewing the Foundations was certainly helpful... If you go to the University tab at the top of the Community, then the Courses menu, you can view just about any of the training courses there. I think you're mainly looking for "Basics 2: Foundation on Demand". I also found taking the foundations quizzes to be quite helpful in preparing. The other webinar/course that I found to be quite helpful was "6 Topics to Know for the Marketo Certified Expert Exam"
If you're in Marketo on a regular basis, and using many of its key features, you should do fine on the exam! Best of luck!