help !

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hello everyone I am from Kosovo I am writing this in English because I want anyone's help whoever can help me , I can speak 6 different languages by a little bit but not all of them so good that means that I have blank parts in the languages I know can anyone give me a list of the things you need to know to become at least B2 or C1 level 

 

PS . when I said I have blank parts I mean that I can say things in Italian but I can not say those things in German for instance , and I can say things in German that I can not say them in Italian

 

thanks for any help