atshy21sarafHappy to help
Well, I'll say that I have a flair for Quantitative Reasoning since High School. I have been actively participating in Math Olympiads and I love number crunching a lot. Having said that, I cannot totally attribute this trait to a great quant score. When I first started preparing I wasn't as good as I am today. Reason is simple. GMAT Quant is quite different from what we have learned at 'high school'. So, what really helped me?
1. I have practised 2000+ questions and the reason that I am able to do them is that I just love solving them. I have exhausted almost everything 'Official' and I'd highly recommend that you at least solve the following:
a) OG Latest Edition 2016 (Or any edition you have 13,15)
b) OG Quantitative Review
c) GMAT Question Pack (This has around 200+ PS and DS questions) - Paid product by GMAC
d) GMAT Prep 1, 2, 3, and 4 (This has a minimum of 37 X 4 = 148 questions. Take the tests at least twice. This will give you close to ~200 questions) -Prep 3 and 4 again are paid.
I have seen a lot of people commenting that the questions in Official Guide and other 'Official' material are comparatively easier than what they see on the GMAT. Even after that, I'd say practice these questions. Why ? Because this will help you think the GMAT way. This should at least take you to a level of Q 45-46!
2. Another reason that I think I do well is that I don't write much when I solve a Math question. I usually do Math in my mind so my scratch pad is not even half filled by the time I complete the Math section. This will be tough in the beginning but trust me as you'll practice you'll realise that it can do a lot good to you. This will save a lot of time. Start doing it on the DS section. Just on my say - Pick a set of 10 questions and set a timer of 20 mins. Behave as if you don't have a pen and paper and do it in the mind. If that helps, thank yourself that you discovered something good. If it doesn't, ignore and move ahead.
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4. Ian Stewart Sets - A must. I just cannot emphasise how good they are. Be it a entry level student or a highly qualified candidate.
5.
MGMAT 5 Books (If you have time) : Make notes of important rules/formulas and jot down few examples and solution to questions that you stuck at.
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Those who would like to build their basics, they can practise Manhattan Guides before doing what I have listed from Step 1 ]
And yes, whatever questions you get wrong from any of the sources that you are practising from, keep noting them down in Microsoft Word file along with the best possible explanation available on the Internet so that by the time you finish your preparation you have a handful of questions to review. Revise them after a period of 7 days. Keep accumulating and keep revising. This is the most important thing to scoring well on Quant (or rather on Verbal Section too)
Hope this helps.
Let me know if you have any doubt. I'd be happy to address