Please take some time to review the areas that are covered in each of the checklists as you prepare for your over the shoulder exam. These are common scenarios that you might very well see on the actual exam.
Also, when on the scopes during SMT and you come across a ZLA controller or someone who you know flies ZOTSOT, please feel free to ask them to "test you" informally if you would like to work on a specific area. I don't know a single ZLA member who wouldn't be happy to help a fellow controller out on a specific area of study or task.
Have fun and learn much,