These are the five hardest questions from the country’s notoriously challenging college-entrance exam, a batch of problems so puzzling a top official resigned.

English grammar may look easy at first. But we all make silly errors without even realising it. Most of you write or speak English with confidence. But later you realise a small mistake has flipped ...

Sponsored content: created in partnership with the Duolingo English Test. For international students, one of the most common questions during the application process is: Do schools actually prefer ...