Hi amnesty17,

A 680 is a solid, competitive score and puts you in position to apply to any Business School you want. If you can answer a few questions, then I'll be happy to advise:

1) What schools are you planning to apply to?
2) What resources have you been using to study?
3) What type of deadline(s) are you on?

GMAT assassins aren't born, they're made,
Rich

Hello Amnesty,
Another couple things to think about

1) Do you know where your weaknesses are exactly? It's not enough to say "the verbal section". You need to know exactly where your problem areas are. For example, you might have trouble with modifiers in the sentence correction part. Another common problem area is the rates and work section in math. Go through all of your old questions that you've done and try to find out exactly where you've been having problems.

2) While I like the Manhattan and GMATPrep tests, I've seen a couple people that scored well who went to the Kaplan tests after they ran out of the other tests. Doing more of these would probably help you with your stamina

3) Have you done all of the official guides? What about the question pack from the GMATPrep software?

4) Finally Rich made a good point that a 680 might be sufficient to get you into the school that you need depending on your background. One of my students last year got into Harvard with a 680.

Cheers!
Dan