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Find a legitimate copy of Grammatik aktiv B2-C1 today, then join a VK German learning group to hold yourself accountable. In three months of consistent practice, you will read Der Spiegel with surprising ease—and finally understand why native speakers say "Es hat mich gefreut" instead of "Ich war froh."
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The book includes a Einstufungstest (placement test). Take it honestly. If you score below 60%, go back to the B1+ volume. If you score above 80%, the C1 chapters are your focus.
The search for "grammatik aktiv b2-c1 vk" reveals a larger truth about language learning today: learners are resourceful, community-driven, and hungry for accessible materials. The Grammatik aktiv series is a masterpiece of didactic design—it can genuinely bridge the gap between shaky intermediate and confident advanced German.