LISTENING
More practices on:
https://englishpracticetest.net/practice-pet-b1-listening-tests-with-answers-and-audioscripts/
GRAMMAR
https://engxam.com/cefr-levels/cefr-level-b1-grammar/Â
Emails
https://learnenglishteens.britishcouncil.org/skills/writing/b2-writing/informal-email