Here’s a direct guide to finding what you need, plus the structure of the paper itself. In the C1 Advanced exam, Use of English is Part 1 of Reading and Use of English (Paper 1). It tests grammar and vocabulary through 8 short tasks.
VK is a popular source for free Cambridge exam resources (PDFs, answer keys, and online tests) shared by teachers and learners.
It looks like you're searching for study materials for the paper, specifically from the social network VK (Vkontakte).