Hello guys!
I am glad I found this thread!
Here is a GMAT Blog by Apex I found really useful during my prep - https://apexgmat.com/vlog/
They post 2 times a week and their content is either articles, videos, or infographs. Most of them are targetted towards one-on-one GMAT preparation. What I found interesting is that they speak about habits like the effect of coffee, sleep, and confidence on test anxiety - things that I did not thought have that much of an influence on my performance.
They also work closely with non-native speakers and with people with disabilites. I'll be happy if any of you finds it useful!