Hi
GeauxSwishThanks for posting. Great question. You don't say what your score is or the schools you are targeting, which can be useful context. Assuming you are aiming for a Top 10 school with a GMAT score significantly below the 720 averages we see, it can be helpful to write an optional essay. I do recommend addressing "why" you are writing the essay head on. Don't make them guess why you're including this information. Then, within the essay, you want to highlight your quantitative ability through significant academic and professional accomplishments. You don't need a letter from your tutor -- what would they say?
At this point in the cycle, I have to assume you are applying R3. If you are applying R1, many of our clients take the GMAT three or four times so don't give up! Keep working with your tutor (or perhaps try a different tutor if you are not progressing).
You may find our optional essay guide helpful here:
https://shop.mbamission.com/products/mb ... says-guideKrista