I'd start a binder with info for each school - what prereqs they need, what eLORs they need (GeeQued suggested 2 vets and 1 professor, but some schools specify they want 2 professors, or an advisor, etc. etc.) Also, if you can figure out what supplemental apps will have for essays, it can be super helpful when writing your PS - all the schools I was applying to asked for a separate diversity statement, so I didn't include that info in my PS.