I had been studying Japanese by myself for a few years, and then I could pass the JLPT levels 3 and 2. But when I started to prepare my textbooks for the level 1, I noticed that it would be really tough to study that level of grammar and vocabulary by myself. That's why I decided to search for professional help and started to take lessons with OLS. With Sakurai sensei's support, I passed the JLPT N1.
I really recommend the OLS lessons. The fact that you have a real private lesson, only you and the teacher, makes the lessons extremely effective. You can focus on the points you need to improve.
