Vocabulary
C1 is all about polishing your English. How do you do that?
By mastering your grammar and vocabulary.
Check this website out: http://www.englishvocabularyexercises.com/vocab-categories.htm
Do the exercises. I have done them myself, they are excellent!
Have fun and good luck!
14 general CEFR topics:
100 words to impress your examiner: http://www.world-english.org/improve_vocabulary.htm
Vocabulary quizzes: http://www.eslgold.com/vocabulary/advanced.html
The English Page Vocabulary Section: http://www.englishpage.com/vocabulary/vocabulary.html
1. personal identification
2. house and home, environment
3. daily life
4. free time, entertainment
5. travel
6. relations with other people
7. health and body care
8. education
9. shopping
10. food and drink
11. services
12. places
13. language
14. weather