Is there a duolingo project for C2 level in English?

Hello I am thinking of starting my PHD and I would like to enrich especially my vocabulary abillity. When it comes to basic Spanish I think Duolingo is very helpful. So I am thinking if there is any "tree" or project, in general, that would help me in an advanced level like this?

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Μάθε Αγγλικά αφιερώνοντας μόνο 5 λεπτά τη μέρα. Δωρεάν.