There is nothing to say about the number of words. Reading more and watching news is a good way to master vocabulary. You should be able to master basic phrases and sentence patterns, and you should not make mistakes again. The language difference between German and Chinese is that there are more verbs and adjectives, while Chinese nouns are more. Germans like to use various separable verbs. This kind of reading more and remembering more is more useful, because you are learning basic verbs at this stage, and mastering more advanced ones will make it easier to enter Hauptstudium.