"Worry over" idiom correct or incorrect ?

[tapesh]

Hi,

I see some correct usage of "worry over" idiom on dictionary and NYT, but MGMAT SC guide says this idiom is incorrect.

Could you please clarify this discrepancy and should we consider this idiom as incorrect in GMAT ?

Thanks for your help,
TapeshK

[tim]

Yeah, here's the deal:

When the GMAT disagrees with the New York Times or your high school English teacher or anyone else, THE GMAT IS ALWAYS RIGHT. This is one very important principle you must keep in mind when you study sentence correction. If you want to do well on GMAT sentence correction, you must approach every discrepancy not with a desire to reconcile two different views but with the perspective that the other guy is WRONG and the GMAT is RIGHT. Then when you see the New York Times express something in a way that contradicts GMAT rules, you can just sit back and enjoy the fact that you can recognize GMAT grammar mistakes rather than question whether the GMAT messed up somewhere..