Here you have some C1 ESL podcasts you can use to practice your listening skill while revising vocabulary and topicss. And you can also take advantage of the pdf document to boost your pronunciation:
Phrasal verbs about health pdf script
Emotional Intelligence pdf script
Idioms about clothes pdf script
American vs. British English pdf script
Making a good first impression pdf script
MEDIATION VIDEO:
C1 SPEAKING PRACTICE:
ORAL MEDIATION (J-19) PTO (J-19) CPTO (J-19)
ORAL MEDIATION (S-19) PTO (S-19) CPTO (S-19)