Greetings, everyone!
Today was an awesome day as I've got 730 on GMAT! I was little bit surprised by the result but let me tell you everything in a straight order.
Background:I'm from Russia, currently getting bachelor's degree in sociology. I read and watch everything in English (reddit and such sites help immensely), but obviously I'm not very good with grammar. Because of that Sentence Correction was my biggest fear.
Q48 is really good for me because 2-3-4 years ago I would consider myself math-retarded. But then I saw the light and beauty of math, simplicity of it.
PrepI have attended specific GMAT+TOEFL courses which were pretty good for a start but I believe those are unnecessary. I was actually amazed by Number Properties book as I wasn't taught almost any of it in the course. Although I was taught how to do complex Combinatorics and probability problems (that, though, can be easily done by yourself using Manhattan).
Best resources: OG,
Manhattan Books (GODLIKE), GmatClub math book (extremely efficient),
gmatclub tests and gmatclub toolkit.
Gmatclub tests are pretty good because you get so much truly good problems to solve. I felt like each test was kind of grouped around specific topics, so my results ranged from 35 to 47.
What did I do + advice on error log/your weaknessesAs I have already written,
Manhattan Books are godlike. I believe that's the place to start. Pay special attention to number properties book and word translations. I believe these two are probably the best books you can lay your hands on.
After you get all the necessary theory via books or VOD-course (like "interact" or something-something on
magoosh, etc), it's time to go completely ham on practice questions. (You should do them while you learn concepts, obviously, too)
I've found that just doing excruciating amount of problems is the way to go. I was anxious about Sentence Correction as I'm not a native speaker (you can clearly see that from this post). So I just did a lot of problems.
Another thing that I notice in many GMAT-takers that wasn't suited for me, is trying to allocate specific days for specific parts of the GMAT. That wasn't the case for me as I was doing both math and verbal in the same day.
Now I'd like to talk about
error log and stuff. Some may know their weaknesses without a single doubt while others need to keep a journal where they log their mistakes. You can just log area of your mistake (let's say divisibility) and WHY did you do that mistake (didn't pay attention to question, miscalculation, not knowing how to solve it, etc).
I assessed 3 tests from Manhattan with my main mistakes and after that I reread relevant theory. It is important, imo. If you make a mistake, it probably means that you lack understanding of basics (unless you just answered the wrong question).
Another thing that helped me power through specific areas was doing tens of problems in this area in a row. Let's say you feel uncomfortable in Work-rate problems.
Do one. If you've got it wrong, look at solution, then close the solution, and resolve the problem again. It may sound silly but it actually helps you understand the solution. Do not go mindlessly over it, relive the problem. After that, solve next. Cycle repeats. That's how I somewhat beat my fear of SC. This method works much better on math problems than on verbal, imo.
Also, I've got my TOEFL results - 113/120.