Many Goethe-Institut libraries and university German departments have copies of Begegnungen A1 with teacher’s editions. If you are enrolled in a course, ask your instructor for access.
Without exaggeration, the solution key cuts your self-study time in half. You stop guessing and start learning. The €10–€20 investment in the official workbook (which includes the Lösungen) pays back in exam success and real German fluency. begegnungen a1 pdf losungen