After finishing A2.1, you can attempt the Goethe A2 exam but will miss some topics (e.g., comparative adjectives, clauses with dass/weil – those are in A2.2).
The A2.1 volume typically covers the first half of the A2 level (Lektionen 1–12). Notable topics often include:
Record yourself on your phone answering the “Sprechen” task. Compare with the model solution in the teacher’s manual (available online).