PET practice

Here, you can find some websites in which you can practice the listening and the reading skills of the B1 level. That's a good way to be ready for next year since you'll have to do these types of exams.

https://www.examenglish.com/PET/pet_listening_part2.htm

http://www.cambridge.org/elt/objectivepet/tests.htm

https://vlec.es/tutoriales/ (In this website you can watch videos of the speaking exams that other children have done. You have to find the level and watch it! In my opinion, you have a higher level than these children so you will not find any problems next year).