if i do the questions topic wise from last 3 OG than by default i understand the question pattern and learn different concepts for same topic.
Most people don't learn just by
doing the questions. A few seem to—we're the ones who end up teaching this stuff—but we're learning so well because we're actually performing the kind of analysis that my article talked about.
Are you asking yourself the questions from this article? Are you making flash cards of the Know The Code variety?
http://tinyurl.com/2ndlevelofgmatThe ultimate thing you're trying to learn is this: What lessons can I use from this problem to adapt to some
new problem in future—one that is not exactly like this one but shares some similar characteristic or characteristics? And how can I learn that in a way that will allow me to apply the lesson the
first time I see that
new problem in future (since that is what will happen on the real test)?
If you're not already doing that with these problems, then it's time to start.
Also, doing the problems by topic can be problematic, because you already know the kind of problems you're about to do. On the real test, you'll never know in advance. Everything is mixed up and you're not given any information about what's coming next. Instead, you have to figure out what each question is when it pops up. It's okay to do a few problems by topic or type when you're first learning something new. But in general, it's important to mix up your studies—to mimic the real test. This even has a name: Interleaving.
Take a look at this to learn more about interleaving:
http://www.beatthegmat.com/mba/2015/07/ ... s-say-what