I encouraged all students taught by me to partner with a different race classmate when they are having cooking session. No compulsory but encouragement.
It seemed quite effective. In this case, they would use common language—English instead of Mother tongue. Hopefully this strategy works.

Reminder: Since term3 week 3 onwards, I use different ways to remind students to submit assignments and pre-study theory going to learn.
Term 3 week 3: a small piece of reminder each
Term 3 week 4: a piece of reminder for each class (display on Notice board)
Term 3 week 5: a piece of reminder for each class (included those are not taught by me) This reminder also showed the objectives of the lesson (Notice board)
Term 3 week 6: To inform them for Week 7, 8 and 9 as well. And also ask them to write in their Organizer.
The main purpose is to send message to students : Pre-study is as important as revision .