Hi Ashley!
In terms of how test questions are typically written, they should not be creating questions about specific research studies and the results. They will stick to overall themes and ideas.
I would prioritize systematic reviews and articles that have high applicability to clinical practice – such as the CP motor curves or Novak’s stop light review. These are summarizing important bodies of literature so they are able to get more information to you in just one article than all of the articles they are summarizing.