It’s a aimed at upper-intermediate (B2) learners preparing for the IELTS exam (Academic or General Training). The PDF version is widely shared online, but the original is published by Global ELT , part of their The Vocabulary Files series (levels A1 to C2).

Copy tricky words into or a physical box with flashcards. Review 1 day, 3 days, 7 days, 30 days later.