Hi everyone!! Your links:
GRADE 1
GRADE 2
Opposite adjectives
https://agendaweb.org/exercises/grammar/opposites
https://agendaweb.org/exercises/grammar/opposite-words
GRADE 3
Revision vocabulary: FREE TIME
https://agendaweb.org/exercises/vocabulary/hobbies/activities-1
https://agendaweb.org/exercises/vocabulary/hobbies/activities-2
http://www.learningchocolate.com/content/hobbies-1
GRADE 4
LIKES AND DISLIKES
https://learnenglishkids.britishcouncil.org/es/archived-word-games/make-the-sentences/likes-and-dislikes
GRADE 6
Past Simple: Revision
https://www.ego4u.com/en/cram-up/tests/simple-past-1
Irregular Verbs
https://www.ego4u.com/en/cram-up/grammar/irregular-verbs/exercise?
Past simple: Verb TO BE
https://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?03
Past time expressions: AGO, IN, AT, LAST
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-24228.php
GRADE 7
Modal Revision: Multiple choice
http://esl.fis.edu/grammar/multi/modal1.htm
Choose the right Modal
http://www.myenglishpages.com/site_php_files/grammar-exercise-modals.php
GRADE 8
Linking Words
http://www.english-in-chester.co.uk/e-learning/lesson/linking-words/
Complete with ALTHOUGH, IN SPITE OF, BECAUSE, BECAUSE OF
http://www.english-grammar.at/online_exercises/connectives/con009.htm
GRADE 9
Mixed Conditional Exercise
https://elt.oup.com/student/solutions/upperint/grammar/grammar_09_022e?cc=global&selLanguage=en
https://www.ego4u.com/en/cram-up/grammar/conditional-sentences/exercises?06