Here there are some suggestions to review your English during the holidays!
3rd Grade
Holiday English 3 Student's Pack Catalan 3rd ed. - ISBN 9780194546249
4th Grade
Holiday English 4 Student's Pack Catalan 3rd ed. - ISBN 9780194546256
5th Grade
Holiday English 5 Student's Pack Catalan 3rd ed. - ISBN 9780194546263
6th Grade
Holiday English 6 Student's Pack Catalan 3rd ed. - ISBN 9780194546270
... and still more
Vocabulary memory games
Vocabulary and grammar online games
Grammar and Spelling online games
Action verbs grammar game
Daily routines sequencing exercise
Present Simple vs Present continuous game