What is another word for pop quiz?

Here are some other words for pop quiz, depending on the context and tone you want to convey:

Formal:

* Surprise test

* Unannounced assessment

* Informal evaluation

* Spot quiz

Informal:

* Pop test

* Quick quiz

* Sudden quiz

* Catch-up quiz

* Grab-and-go quiz

Humorous:

* Ambush test

* Gotcha quiz

* Surprise attack quiz

The best word to use will depend on the specific situation.