I am an international PhD student from China.
English Upside Down has really helped me to express my intentions in clear and structured sentences. And my pronunciation of English has improved enormously. According to my professor, the first few presentations I had to give were barely understandable. But recently my colleagues and professor complemented me on my progress.
For me, it was the combination of weekly group lessons and biweekly private lessons that helped me to work on a good grasp of grammar, better pronunciation and freedom to express myself clearly.