Although the new gre allows you to move around within

Although the new GRE allows you to move around within a section and come back
to questions you previously left blank or wish to reconsider, keep in mind that, if you
don't know the words, you won't do any better by attempting the question
twice —you'll only waste time and lower your overall score.
If you don't know the words, do not leave the question blank . Make your best
guess and move on. Don't waste time coming back—spend that extra time on
Reading Comprehension or other vocabulary questions that you are able to answer
more effectively.
In sum: learn the words!
Why It Is Important to Learn Words in Context
Educational Testing Service tells you not only to check that the two answers you
select for a question create sentences that mean the same thing, but also to make
sure that each one “produces a sentence that is logically, grammatically, and
stylistically coherent.”
Hmm. Asking test-takers to check that the completed sentences are “grammatically
coherent” implies that some of the choices will create sentences that are not. Here's
an example:
Education advocates argued that the free school lunch program was vital to
creating a school environment _____________ to learning.
conducive
inimical
substantial
appropriate
beneficial
hostile
“Education advocates” are certainly in favor of learning; your fill-in might be
something like helpful .

Looking at the choices, conducive , appropriate , and beneficial all seem to be
matches.
However, if you place each word into the sentence, one choice creates an incorrect
idiom. “Conducive to ” works, and “beneficial to ,” but “appropriate to learning” is not a
correct idiom—instead, you would say “appropriate for learning.”
Thus, it is important not only to memorize dictionary definitions of words, but also to
be able to use those words in context, in a grammatically correct way.
Here's another example:
He's a _____________ fellow, always grandstanding and deploying his
formidable lexicon for oratorical effect.
declamatory
grandiloquent
didactic
florid
titanic
cabalistic
The target is “he” and the clue is “grandstanding and deploying his formidable
lexicon for oratorical effect”; that is, he speaks in a pompous way, as though
showing off his vocabulary for an audience.
The word florid seems appropriate—it means “flowery” and often applies to speech,
as in “florid poetry.” But wait! Florid applies to writing, speech, decor, etc.—not the
people who produce those things! (Actually, you can apply florid to people, but in
that context it means “flushed, ruddy,” as in having rosy cheeks, which is not
appropriate here.)
The answer is declamatory and grandiloquent , both of which describe pompous
orators (that is, people who make speeches) or the speech of such people.
Memorizing that florid means “flowery” is better than nothing, but doesn't really tell
you what kinds of things to describe with that word, or how to use it metaphorically.