【求助】不清楚语言要求

duckyy

如果要申请语言班的话，语言要求是
Studying with a preparatory German course
If you apply for studies with a preparatory German course， you need to submit the following certificate:
•    officially certified proof of German language proficiency: intermediate level, i.e. a completed "Mittelstufe I" with at least 65 % of the maximum grade achieved. Language certificates will only be accepted if they are not older than 1 year
怎么证明是中级水平啊？