Hi rajeevrks27,
I wrote the 450 questions to capture as many of the recently tested GMAT concepts in the fewest possible number of problems. There are many new ideas and concepts that have been added since Pearson Vue took over writing the GMAT in early 2006(harder questions on sequences, functions, parabolas, circles and line intersections, standard deviations, etc. that are relevant only for 90%+ scorers in quant), and unfortunately a lot of these have not been released as part of the Official GMAT guides, including the 13th Edition.
This is especially important for students scoring near the very upper end of the score chart. An example would be a problem that hinges on the use of the computational formula for the standard deviation. Prior to 2009, I used to think that if GMAT writers were to test any concept on standard deviation, then either it will be a conceptual question that does not require knowing the expression for standard deviation, or if it does require one to compute the standard deviation, then they provide the formula with a clear explanation of the terms. This is no longer the case because some questions might require you to recognize the computational formula for the standard deviation, or at least be able to rearrange the general formula for standard deviation and arrive at the computational formula. The example I gave here is only of relevance for people targeting the 95 to 99% on the quantitative section.
Cheers,
Dabral
rajeevrks27 wrote:
hi AbhiJ,
never heard about GMAT Boost 250 Questions, Ian Stewart Questions and GMAT Quantum 450 Question. It would be really great if you elaborate little on them.
one more thing, i have heard great guns about jeff sackmann's challenge sets, i think they also have good 700 level questions.