Hi
grahamtandrew, while Idioms
continue to play a part in Sentence Correction and can often provide a good way to
split the options, idioms will rarely ever be
make or break in an option. In other words, an option that uses an
incorrect idiom, will
also have some other error(s). This is something that GMAC mentioned few years back.
In view of this, we believe that it's an
overkill to
memorize hundreds of idioms. Our book
EducationAisle Sentence Correction Nirvana discusses the most
prominently tested idioms on GMAT, and their examples. If someone is interested, PM me your email-id; I can mail the corresponding section.