I have two questions:
1. Approximately what number (or range) do the 600 level problems start for the problem solving and data sufficiency sections in the OG ?
2. In the OG tracker I received with class, the problem solving and data sufficiency tabs have each problem categorized as "advanced" or "general". What constitutes an "advanced" question? Can you define a difficulty level or something like that?
Thanks for the insight.
Casey