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Great job on the quant. For the verbal, you mentioned that you prepared for about a month - that's not very much time, not for your weaker area. :) Most people prepare for 3-4 months.
You mention working from our SC Guide but you don't mention any similar CR or RC materials - what did you use to study those question types? (Note: I don't mean OG or question banks - I mean materials that are designed to teach you how to do those question types.)
For SC, some questions do have split that are easier to see and some have harder splits. You do still have to have grammatical splits (splits = differences); if you didn't have any grammatical differences, then the questions couldn't actually test grammar! So they were there - but you weren't able to decode them.
Most of the time, that will happen on questions that are testing what we call global issues: Structure, Meaning, Modifiers, and Parallelism. Meaning is actually tied to grammar - mess up modifier placement, and you mess up meaning. Change structure and you might change the meaning. Use the wrong verb tense and you've just messed up the meaning. Etc.
So my guess is that you've got two things to work on here:
(1) brushing up on those global issues
(2) learning to deal with less-obvious splits
You aren't going to see as many "single word" splits as you saw in the past. You are going to see more answer choices that change structure and word order more substantially, so you're going to have to start learning to view sentences in "chunks" (modifiers vs. the core sentence structure, for example).
You can learn some techniques for this here:
http://www.manhattangmat.com/blog/index ... orrection/There are many examples of these kinds of sentences in OG13, particularly at the higher question numbers. Work through the articles above first (that link above is to a compilation of articles), then go through old OG13 questions (ones you've already done) and look for similar issues.
Next, did any of this affect your timing? Well, actually - it certainly affected your timing. The question is how. Did you spend more time on some of these SCs and then go faster on other questions to stay on pace? Did you run low on time at the end of the section and have to rush to finish? Either way, you likely then made careless mistakes on questions you would have gotten right with normal timing... and that would also pull your score down.
Did you have any CR or RC issues in general? What can you improve there?
Finally, on the admissions query, I'd love to help... but I'm not an admissions expert. I hope some of your fellow students will see your question and respond.