How to progress from 510 to 700

texmex wrote: My approach is that I pick a topic, read it & attempt the appropriate questions from OG 12. Eventually, when I do so, I get all the questions right. But, why am I not able to progress when I attempt a test? Am I doing anything wrong here?

Your situation is not uncommon, and it illustrates the major difference between answering questions from a book and answering questions on a computer adaptive test.
In the book, there's a mix of easy, medium and difficult questions. On the test, the computer-adaptive nature pretty much ensures that you are receiving questions that are just on the fringe of your abilities. PLUS there are time constraints. PLUS, the practice tests take about 3.5 hours.

Basically, the GMAT is a test of your math and verbal skills AND it's a test of your test-taking skills (time-management, endurance, anxiety control, etc.). It sounds like you know the material, but your test-taking skills need some work.

If you're interested, we have a free GMAT time management video at https://www.gmatprepnow.com/module/gener ... es?id=1244

Cheers,
Brent