Inequalities are often used to disguise other issues or principles. See this article for an example:

http://www.manhattangmat.com/blog/index ... qualities/Rates, work, sets, and probability are not super commonly tested. Know how to answer lower level Qs of these types and know how to make a good educated guess. Then move on. :)

The VIC (variables in the answers) technique can be used quite a lot - so that's an important one to study.

http://www.beatthegmat.com/mba/2010/10/ ... arithmeticIn general, you also need to be able to cut yourself off on any too-hard question in any category, even a strong area for you. Don't expect that you'll someday have studied enough such that you can answer everything correctly and in 2 minutes or less - that doesn't even happen for people scoring 750+. :) Read this:

http://www.manhattangmat.com/blog/index ... anagement/For simultaneous equations, it's important to notice something really important. In school, we were told the old rule of "2 equations, 2 variables" because you do need 2 distinct linear equations in order to solve separately for each of the 2 variables.

On the GMAT, though, they often don't ask us to solve for x and y. Rather, they might ask us to solve for x+y instead. That's very different - sometimes you can solve for that combination of variables even though you can't actually solve for x and y individually. Alternatively, they might give you three variables (a, b, and c) and only ask you to solve for c. And it might be possible to solve for c even if you can't also solve for a and b.

In other words, unlike in school, this test often does NOT ask us to solve for all of the individual variables. So if you just stick with the rule from school, you're going to fall into a trap - because the rule from school assumed that we did have to solve for all of the individual variables.

CR general:

http://www.manhattangmat.com/blog/index ... g-problem/CR assumption:

http://www.manhattangmat.com/blog/index ... -problems/RC reading: the harder the passage, the LESS time you spend getting sucked into the details. Try to get the big ideas. If you have to bail on some very nitpicky detailed question, that's okay.

http://www.beatthegmat.com/mba/2010/04/ ... mp-passagehttp://www.beatthegmat.com/mba/2010/07/ ... rc-passagehttp://www.beatthegmat.com/mba/2010/06/ ... on-problemhttp://www.manhattangmat.com/articles/GMATprep-SC.cfmI am also facing one more issue. I already know a significant no of GMAT Prep Ques. Can i trust it now ?Is there a way out of the this problem ?

( But i must add that in my last test i was knowing some questions but still i got a low score

You may know the answers, but that doesn't mean that you've learned what you need to learn in order to get better. See the "how to analyze SC" article (the last article I linked to above). If you aren't analyzing questions in this way, then you're not learning what you need to learn from these questions - so going off and trying a bunch of new questions is a really inefficient use of your time. Learn to get better THEN try new problems.

Also, if you recognize too many GMATPrep problems now, then you shouldn't use GMATPrep to get a sense of your current scoring level. You can still do the Qs for practice, but you should use something else when you want to take a full test and try to get a sense of your current scoring level.