Please help me with rc questions I can not choose between last 2 optio

Hello, mangamma. Once you have narrowed down the answer choices to a 50/50, you want to go against your initial thought process, perhaps, and look not for which answer seems better, but for which one is easier to argue against. Get rid of that one and choose the other. Sometimes it is just a word that throws off the answer that had seemed more likely. Less obvious caution signs are definitive language--e.g., must, can or cannot, always--often used in overreaching answers (versus words such as could, may, or some[times]) or overly detailed answers to questions that demand a broader approach (e.g., main idea or primary purpose types of questions). Always keep an eye on what the question is asking, and again, weigh up the cons of each answer choice to determine which response loses out. I practice what I preach, too. In an effort to show a student of mine why timing each RC question is a bad idea, rather than focusing on timing per passage or cluster of questions, I recently went through a practice set of official RC questions through Wiley that I had never laid eyes on. To be honest, some of my timing was not the best, but on the whole, I made my point: I got every single Hard question right, and my average time per question was 2:02, nothing that would worry me when my average time per Hard SC question, stretching back several months through this site, is a minute shorter, at 1:02, with a single error. Here are those RC results:

https://docs.google.com/document/d/1fDCDpVP7hTfKQ6JP6bDI4EhmISH4GaBmUuz7bwXRp00/edit?usp=sharing

A few years ago, when I started helping clients prepare for the GMAT™, I took it upon myself to break down exactly why I was missing any question on the whole test, and with RC, what I have outlined above is exactly what allowed me to go from decent to quite strong at arriving at the correct response, even to more nuanced questions.

I hope that helps. If you have any further questions, or if you wish to discuss specifics, feel free to reach out.

- Andrew