I get around 29/52 ans correct. I’m a pretty slow reader (The only books I read are the ones for exams so no reading habits… ) I joined Princeton prep classes where they taught me how to do the section without actually reading the whole thing but my main issue is that way I can’t figure out what the passage is about and have to reread bits again and again. I want to boost up my score to atleast 40 on 52… For this I got Critical Reader by Meltzer 2nd edition. How to use it effectively. I can give around 30min daily till the march Sat(last attempt) as my school hours are very long.
If you’ve taken practice tests from the official SAT book, there is an index in the back to matchmyour mistakes to the chapters of the book.
Otherwise, just start at the beginning and put in your 30 minutes a day.
Is reading her book and doing questions in it going to help enuf?
It is high quality material. There’s no way for someone on this board to tell you if it’s enough. You need to assess your progress as you work through it or use a tutor who can assess you.
Hey! Here’s some tips I compiled for getting better at comprehending the reading passages:
-What is the main idea?
You should be able to put this into a couple phrases, not necessarily a long sentence. Try to start at the broadest possible level and then narrow more and more. So start with the general topic, then try to figure out what the scope of the passage is. That is, if the passage is about dinosaurs, what part of dinosaurs are we talking about? Skeletons? Fossil records? Biology? Coloring? Why they disappeared? Relationship to modern day birds? Through this process, you should be able to narrow and narrow until you have a good summation of the main idea.
-What is the structure and flow of the passage?
You need to pay attention to transition words in the passage. You need to think about where you have been and where you are going in the passage. How does this paragraph connect to the main idea? What’s its purpose in terms of the main idea? And how was it connected to the previous paragraph? Through these questions, you will get a “road map” of the passage. You’ll have a sense of what happens where. And you will have a better understanding of examples or reasons because you will know their purpose in terms of the main idea of the passage.
-What is the author’s tone and what is the author’s purpose?
You always want to try and infer the author’s opinion about the topic. The author’s opinions and beliefs will leak into the passage and influence the word choice and position in the article. So pay attention to the positive or negative tone of the adjectives and adverbs in the passage. In terms of the author’s purpose, we don’t have to do too much work. There are really only four reasons that people write something: to entertain, to persuade, to inform, or to describe. Obviously, passages will have elements of all of these, but usually, there is one main reason that author sat down to write what you are reading.
I hope that helps you a bit! Hang in there 
Thank you so much @schoolcounselork. Your reply is very helpful to me too