Fascination Über 購買b1證書無須考試
Duration: depending on your current level. If you are already on examination level, 10 teaching units may suffice to familiarize you with the testing format. If you still need to improve your level, you may need more (check how long does it take to reach the testing level). 是德國人在教美國人德文的頻道，所以可以一次聽德文