We highly recommend you to visit these links to revise Grammar: Verb Tenses, Conditionals, Passive, Relatives and
if you want to practice exercises online, then, these are your links. Don´t forget to ask any doubts to your teacher.
https://english.lingolia.com/es/gramatica/tiempos-verbales/past-perfect-simple
http://www.englishgrammarsecrets.com
https://www.ego4u.com/en/cram-up/grammar/simple-present
Now you can practise Grammar exercises on these links