As you know, we will do the Exit Test on Monday.
So there will not be a Unit 4 test.
But you should still study Unit 4 because it is one of the four units on the Exit test.
We did not study the passive, but there might be some questions on the Exit test.
You can study it from Unit 2 and Unit 3 smrt:
2-4 Present Passive
3-4 Past Passive
Here is a good page (but hard to read) about the Passive
Read the top of the page and then do the exercises.
Here are the ANSWERS.
Here is more website practice: #1, #2, #3