Study the Rivstart B2+C1 book thoroughly. Complete every writing task. However, realize that the leap from C1 to C2 requires output. You cannot learn C2 by reading a textbook; you must produce the language.
Remember: If you are at C1 level, you are already adept. You don't need a PDF crutch. You need real-world Swedish. Pick up a novel by Liza Marklund, listen to a government inquiry (SOU), and start debating politics with your neighbors. That is the real rivstart c1 c2 pdf