I’m also an int. student. Got into HBS. 4 years IB, 700 GMAT, worked with Sandy for 15 hours on my HBS app. and as everyone notes on this thread, he really knows how to do it. He made suggestions about tone (!), content, upgrades, spin, and which events in my personal and work life to write about.
I really don’t think I could have achieved it without Sandy’s intense help. In my opinion, he is the choice for the top schools like HSW…