Assimil - Novi Nemački Bez Muke Sa Integrisanim Audiom - Scribd

If your budget is tight, consider:

: You follow characters through various situations, picking up grammar and vocabulary naturally as you go.

: Every lesson includes a simplified phonetic guide to help beginners master the unique sounds of German, such as the sound and long vowels. Grammar Notes

A: It brings you to approximately A2-B1 (low intermediate). You will need additional materials for advanced fluency, but you will have an excellent foundation.