I worked with Admit Square for my International school MBA Applications and interviews. I received an admit from both Cambridge and Oxford - with scholarships - despite a low GMAT score.
Essays: As this was the first time I was applying to business schools and I hardly had any knowledge of the quality of the essays required for these programs. Moreover, my GMAT score was pretty low for these schools and my terrible work schedule didn't allow me sufficient time to focus on my application. One week before the deadline, I decided that I will go with R2 instead of R1. My Consultant convinced me to apply in R1 itself and assured me that we could complete the application within the restricted timeline, something that I didn't trust myself with. With multiple iterations and great assistance with inputs on my story and quality of the essays, I could complete the application.
Interview: I had 3 mock interviews with Admit Square taken by Ivy League alumni on the Admit Square team. I remember my first interview, where the interview went so terrible. But after the valuable feedback from my interviewers and the personalized counselling with my consultant, the final interview with my MBA program was fluent and easy.
The entire process was enriching and insightful and I learnt a lot beyond just the development of the application. Thanks to Admit Square, I will be joining Cambridge this fall (unless I get INSEAD, which I am currently working on)!

Happy to provide any specific feedback that you may seek. Feel free to drop a line to soniya6.nitk[at]gmail[dot]com
All the Best for your application!