The most straightforward way to obtain the "Linie 1 B1 Testheft" is by purchasing it. The official publisher, Klett, has digitized many of its products. The is available as a digital product on the "allango" learning platform. This platform is browser-based and works on smartphones, tablets, and PCs. The Testheft itself costs 21.99 EUR for the digital version. You can also find physical or digital copies from various international book retailers, such as:
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