Don't just check if the answer is wrong; understand why it is wrong using the answer key.
Get the free curriculum for 1st-year English in Austria (Lehrplan für die Unterstufe – Englisch, 1. Klasse). This tells you exactly what topics appear on Schularbeiten.
Go directly to the Veritas publishing house website. Look for the "More 1" product page. Often, publishers provide:
Instead of risking sketchy downloads, take advantage of these highly effective and safe resources to prepare for your next English exam: 1. Preview Pages and Official Samples