vocabulary profiling

I identified correctly all the words in my tree tries Lextutor's Frequency Trainer.  I think non-native speakers score better results because when they learn that language, they start learning from most frequent words.  For example, in high school our teacher gave us a list of first 1,000 words in English so we learned more frequent ones.  I generally choose the right frequency for words so I didn't surprised too much.  I think word frequency vary in different languages.  Both American and British English have their own word.