Hi Saba,
Based on the Schools that you've listed, you won't necessarily need a 680+ to apply - but if you are going to keep studying until you hit that score goal, then you have to give yourself enough additional time to train to get up to that level. With your current timeframe, you have about 4 weeks of study time before you plan to take the GMAT, but that probably won't be enough time for you to get to a 680+.
1) What application Rounds are you considering for each of these Schools?
GMAT
...
Based on the Schools that you've listed, you won't necessarily need a 680+ to apply - but if you are going to keep studying until you hit that score goal, then you have to give yourself enough additional time to train to get up to that level. With your current timeframe, you have about 4 weeks of study time before you plan to take the GMAT, but that probably won't be enough time for you to get to a 680+.
1) What application Rounds are you considering for each of these Schools?
GMAT
...
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