I have had a look at that book and I find the problems there really hard. Looking at the long solutions, many of those questions would take more than 2 minutes to be solved too.
On the other hand, I have been looking at and solving questions of past GMAT exams and I haven't found questions to be THAT difficult..
Are there really such difficult questions on the GMAT?? Perhaps on the 99% percentile only??
I have also been looking at the "advanced" sections of the strategy guides. Those questions are still hard but still easier than those on the Advanced GMAT Quant Book, right?
If I didn't study any of the Advanced GMAT Quant Book, would I have any chance of scoring more than 90% percentile in Quant? Assume that I will have studied the whole of the Quant strategy guides (normal and advanced material)??
What if I didn't study the "advanced" strategy guide material which I also find quite hard?
Thanks!