Lingq is my friend It's been more than 3 months since I'm using Lingq.com. This website is absolutely great and allows me to assert how many words I do know. So far know around 11,000 words in English. The concept is pretty simple. You can download a hundred of content audio with transcripts or texts only and each word or phrase that you don't know is added to a database and you'll be able to learn it later. All the words that you read and are known are added to your knowledge database. Since I've started to use this website, I've linked more than 1,500 words in order to learn them. I read on the internet that I need to know around 15,000 words in order to get the C2 level. This level is categorized as Native Speaker Level, although I don't think this 'native' goal is attainable... I mean, as a foreigner, I'll never be able to reach this level of speaking because it would imply that I have to leave in the target country and speak 24/7 with native speakers to learn the subtilities of U.S English. The creator of this program is called 'Steve Kaufmann'. He's a hyper-polyglot and speaks at least 10 or 13 languages (each at a different level of fluency). He does videos and podcasts on YouTube and I came upon him a year ago while searching for interesting advice to improve my language. If I remember well, he's between the ages 65 and 70 and have been speaking French as a second language for over 20 years. His level of Korean is amazing (though I don't understand Korean) and viewers told him in the commentary section that they were impressed. As I told you, you can listen to audio content with transcripts in this website. That helps you to hear the music of English and read it at the same time. Also, you can import news articles from other websites. And when there is no audio, I read out loud and try to familiarize with the pronunciation. I this is the key to improve drastically your skills in a foreign language.