I have an excellent experience with TST PREP. Josh’s videos help me understand all my skills better and use them in my exam. I also had some class with Katie, which was informative and helped me improve my writing from 16 to 22. However, I had a couple of lessons with other teachers that I was not comfortable with, but you have some options to choose the teacher who fits your criteria. I definitely suggest TST PREP for people who do not want to waste time and reach their goals quickly.