“Dia Gerontoudi was my private tutor for my GMAT preparation. It was a really stressful period for me because I was working full time at the moment and I had only one chance to score really high in the test because I was a late applicant for LBS. Thankfully Dias unique system got me from lower average to 94th percentile in no time. If you are looking for a methodical teaching system and a mathematical approach with proved results Dia should be your 1st choice. I am really grateful for her contribution to my career path.”