>>11984677You can start reading at any point, but you'll always have some words to look up and sometimes come across odd grammar points that might make sense after you've both read up an explanation for them and seen several examples of them in context.
6k might sound like a lot right now, but then again, there's many books that have over 10k unique different words, so even if it does cover the most common words, it won't quite be enough to cover everything.