When a student highlights a word or phrase (e.g., "a shred of evidence," "tantamount to," "harbour doubts"), this feature provides C2-level insights beyond a simple definition.

Here is a breakdown of what makes this book a staple for C2 learners and what you should know before diving in. What is Upstream Proficiency C2?

: Strong focus on collocations, idioms, phrasal verbs, and word formation essential for achieving a "native-like" command of English.