If you need a clean, official copy for classroom use, you can find physical booklets with keys at specialty retailers: BEBC (Bournemouth English Book Centre) Offers the Enterprise 1 Test Booklet with Key Open Library:
: If you are a teacher or student needing verified hard copies, educational retailers like BEBC offer the physical "Test Booklet with Key" for global shipping. Enterprise 1 Test Booklet | PDF - Scribd enterprise 1 test booklet key pdf
Express Publishing has released multiple editions of Enterprise 1 (e.g., 1998, 2004, 2012). A key for the old edition will not match the new test booklet. (usually on the back cover). Example ISBN for Enterprise 1 Test Booklet: 978-1-84466-XXX-X. If you need a clean, official copy for