You will need about 5-15 games depending on how many students in your class and what size groups you would like them working in. I've found groups of 4 or 5 work great, so a set of 5-6 games is usually more than enough.
Then you need to number the Jenga blocks and Kerplunk sticks (you could add a sticker to the ends of the sticks to make this easier).
The way it works is simple, students work in groups to play the game as normal, but every time they successfully withdraw a Jenga block or Kerplunk stick without causing the crash, they look at the number they have withdrawn and answer the correlating question on their list! Suddenly, answering those boring test questions has become fun?!
You can easily add your own rules and winners where they keep score of how many questions were answered successfully, or students miss a turn if marbles come down / the Jenga tower falls etc, the list is endless!
Believe me, your students will absolutely have a whale of a time in your lessons and they'll be having so much fun they won't even realize they are studying for a test!
So there you have it, testing prep for teens - made fun! If you have a go at this in your lessons, let me know how you got on in the comments below!