You haven't mentioned the course that you want to take up in Kazan Federal University. This is important because the entrance exam syllabus varies for each programme. Neverthless, please visit the official pate https://admissions.kpfu.ru/priem-v-universitet/programmy-vstupitelnyh-ispytanii-skaly-i-kriterii-ocenivania-bakalavriat for your course specific entrance exam syllabus.