Hi WannabeDR,
Everyone at my school that elected to write Part 1 of the boards passed. Most people here in Canada take part 1 after their second year so that some stuff is still fresh in their minds.
Besides reading old notes, many of my classmates bought the "Berkley Guide". They said it was pretty helpful, and when used in combination with class notes, that's all you should need for Part 1.
Hope this helps!