6th Grade

https://www.grammarbank.com/simple-past-passive.html
https://www.curso-ingles.com/aprender/cursos/nivel-avanzado/adjectives-and-adverbs/enough-and-too

5th Grade

https://learnenglish.britishcouncil.org/beginner-grammar/past-continuous-and-past-simple

https://www.perfect-english-grammar.com/zero-conditional.html

Do or Make?

http://www.englishmedialab.com/Quizzes/intermediate/do%20or%20make.htm

Conditional test

https://www.ego4u.com/en/cram-up/tests/conditional-sentences-2

Conditionals game

http://www.eslgamesworld.com/members/games/grammar/fling%20the%20teacher/conditionals/conditionals%20practice.html