According to specialists—and based on the results of people who took this course—this is, as of today, the most effective method for self-learning English. It uses a system of vocabulary memorization for long-term memory. Studying for 30–40 minutes a day, within a couple of months you will start freely expressing your thoughts in a language you previously didn’t have access to, learn to think in English, and understand it by ear.
And it doesn’t matter what level of knowledge you’re currently at—the course materials are designed for all levels, and are intended for both children and adults, and for business people. The course is structured so that you immediately develop practical language-use skills. English grammar is not the most difficult; its rules are presented in the course in the minimal necessary volume.