Here you can find some webpages where you can practise the different levels at Cambridge and Trinity Certificate exams.
Cambridge:
A2 (KET)
Here you can find some mock exams:
http://www.cambridgeenglish.org/exams-and-tests/key/exam-format/
https://www.examenglish.com/KET/index.html
Some useful vocabulary:
https://www.flo-joe.co.uk/keyenglishtest/index.htm
B1 (PET)
Here you can find some mock exams:
https://www.examenglish.com/PET/index.html
https://www.cambridge.org/elt/completepet/test.htm
http://www.exams.richmondelt.com/students-area/target-pet/online-practice-tests/
https://www.flo-joe.co.uk/preliminaryenglish/
https://eslcafe.ru/quizz/pet-preliminary-english-test/
Some useful vocabulary:
https://www.flo-joe.co.uk/preliminaryenglish/
B2 (FCE)
Here you can find some mock exams:
https://www.examenglish.com/FCE/fce_grammar.htm
http://www.cambridgeenglish.org/exams-and-tests/first/preparation/
https://eslcafe.ru/rubrika/fce/
C1 (CAE)
https://www.examenglish.com/CAE/index.php
SPEAKING ACTIVITIES IN GENERAL
https://eslflow.com/speakingandcommunicativeicebreakeractivities.html
TRINITY:
Trinity ise (A2)
Here you can find some mock exams:
https://www.trinitycollege.com/site/?id=3193
Trinity ise i (B1)
Here you can find some mock exams:
https://www.trinitycollege.com/site/?id=3194
Trinity ise ii (B2)
Here you can find some mock exams:
https://www.trinitycollege.com/site/?id=3195
SELECTIVIDAD EXAMS
https://www.examenesselectividadandalucia.com/
https://www.examenesdepau.com/andalucia/
https://www.muchosexamenes.com/examenes/pau-pruebas-acceso-universidad-selectividad/andalucia/
https://www.ejerciciosinglesonline.com/exercises-and-theory/selectividad/
CLASS LISTENINGS
https://www.esl-lab.com/?fbclid=IwAR21YOUr1NVyvQAXmh573OMzIYtaMBp6rSjZUsUB5d-muLZ6oorRcCRqhbk
Now It's time to practise, good luck!