The US schools you listed are not realistic. Even with a higher GMAT, your sweet spot schools are in the top 30, such as Georgetown, Tepper, Emory, Indiana, Purdue, UNC, Texas, Maryland and USC.
The Euro and Asian schools you listed are in range. However, to be safe, you should ideally retake the GMAT and shoot for a 700, given that you're at a disadvantage given your lack of experience (most IT folks tend to have around 4-6 years).
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