Hi, I spoke to the IE representative yesterday, and he said GMAT score of 700 or above is the competitive score that IE looks for. For ST Gallen, given your GPA, I would recommend you to get GMAT score of at least 740. It gives 50% weight on GMAT, 30% on GPA (relevant subjects), 10% on statement of purpose, and 15% on CV. However, if your GMAT score and GPA meet its criteria, the rest will not be considered. For further information, you can check on its website about the admission criteria.
Don't be afraid to fail, but be afraid not to try