“A2 Key 1 & 2” refers to two official practice test books published by Cambridge English – specifically, A2 Key 1 and A2 Key 2 – which contain complete examination papers designed to help candidates prepare for the A2 Key (formerly KET) English language exam. These books provide authentic practice tests, including sample questions for Reading, Writing, Listening, and Speaking, along with transcripts, model answers, and other useful resources, such as audio for the Listening tests.