Hi ritu1009,
I’m glad you reached out, and I’m happy to help. If you find that you are struggling to understand the primary purpose of the passage, it’s likely that you are not quite understanding the content of those passages, right?
When reading an RC passage, it’s important that you understand the passage not only on a micro level (sentence by sentence), but also on a macro level (paragraph by paragraph). So, as you read, do your best to tie together the paragraphs. In other words, ensure that you are able to relate each paragraph to the others to create one cohesive story. After reading each paragraph, make sure you pause to absorb what you’ve read and to tie the content in previous paragraphs to the most recent paragraph. If initially you need to slow down to follow this process, that is OK; you have to learn to comprehend what you are reading. Your goal should be to take all of the time you need to understand exactly what is being said and arrive at the correct answer. If you can learn to get answers taking your time, you can learn to speed up. Also, when reading a passage, attempt to fully immerse yourself in the passage as if you are the person making the argument. By doing so, you will make the passage more relatable to YOU, and that should help you better understand what you are reading.
When you get to the answer choices, be aware that there will be trap answers designed to take advantage of any impulsive or otherwise faulty thought process you have. The question-creators can tell what test-takers may perceive to be the main point of the passage even though it's really not. So, as you go through the choices, carefully consider why you think something is the main point. Do you think something is the main point just because it appeared in the first paragraph? The first paragraph could be merely an introduction to later paragraphs that actually present the main point. Do you think something is the main point because certain words appeared multiple times? The question-creators may be counting on that. So, you have to be careful not to get sucked in by faulty thinking, but instead carefully determine what the author really sought to get across in writing those paragraphs. You must interpret the actual meaning of the author’s argument.
If you have any further questions, please reach out.