Thanks all for your wishes.
Responding to few PMs.
My Verbal Prep:I have already listed down what materials I have used. I picked my strategies from various debriefs. Followed the ones worked for me, discarded the ones that didn't.
Necessary for all sections: You must complete all OG, OG verbal, and GMAT prep question pack problems. I read each and every official explanation, irrespective whether I answered correctly. Often I found, the correct/incorrect answers were correct/incorrect for other additional reasons that I missed.
GMAT Prep Exam Pack and GMAT Prep Question pack match closely with actual exam. OG, OG Verbal, and regular 2 GMAT prep CATs are outdated. I did the former ones during my last month and they were useful.
Sentence Correction:1. You must understand meaning of the sentence, then go for grammar checks. I encountered questions in which grammar error were tough to detect in final 2 options, but meaning wise only 1 of the two fit.
2. Re-read the complete sentence after choosing your answer to ensure that the sentence makes sense or sounds correct.
3. Pay attention to noun-verb, noun-pronoun, adverb-verb, adjective-noun pairs. These are basics. You cannot afford to loose for these.
4. Understand which tense to use when. (read SC grail)
5. Practice a lot and review why you make mistakes.
6. Do not use elimination as your primary weapon.
Critical Reasoning1. Nothing beats CR bible. I had completed it thoroughly during 1st attempt, so used the notes and revisited the question-explanations from CR bible. This doesn't mean the note is enough. I am attaching the notes here. (p.s. I downloaded from GMAT club, no credits to me)
2. I do not use pen/paper for any verbal section. I used fingers to track eliminated answers. This saves some time.
3. Read the stimulus first, then the questions. While reading the question, if you aren't able to find the flaw, then you need to work on argument construction.
4. Read
eGMAT CR topics consolidated: (they say universal truth, which I am lazy to type

)
e-gmat-s-all-cr-topics-consolidated-168945.htmlReading Comprehension1. I don't make notes, cause they are time consuming. Instead I summarise each paragraph in my mind.
2. While reading, please focus on how paragraphs are related to each other and to the entire text. Paragraph Purpose and Main purpose is must to be identified.
3. I read the 1st question, then read the passage. This way, at least you will be focussed to find 1st correct answer.
4. For determining role play of particular word or sentence. Read the preceding and succeeding sentences as well.
5. Do not bring outside information at all. Stay close to what is provided.
6. Look at the transition words (e.g. - yet, still, although, however, but, surprisingly, paradoxically etc)
7. Short passage are complicated, take a breathe and understand the first few lines before moving to next.
In general, do not get stuck in a question for more than 2 and half minutes. If you are not able to find the answer, then guess and move one. During practice sessions, I found that my incorrect answers had higher average time-spent.
Finally, I don't think it is possible to improve verbal from 31 to 47 in one month. Those who say that they have improved, they do not count their back ground. In my case, I did score 23, 31 and 47. However, I do not count them as improvements. I got 770 in my 1st GMAT prep exam 2 year back. It is important what you do on the test day. Be calm and do not overthink (easier said than done).
And I am not a native speaker. I am from rural India and did my schooling from state board. If I could do, anyone can do.