Congrats!! Im surprised USC was a waitlist. I think they do that sometimes with very good applicants because they don't think the person will come to their school.
So you know Wharton and Zhu are always apart. If there are only 2 groups then you can write it as a biconditional W/Z. Because if W is in then Z is not and when W is not in, then Z is in. Now if there are 3 groups or more, you can't write this rule …
When i get a certain question type wrong on LR, i go to the question bank and find the same question type and do the hardest ones (level 5) of that question type. If i get them wrong at the beginning, I start on level 3 or 4 and gradually move to hi…