Everything chapters 1 and 2 is fair game for the lab.
Know about variables, loops, and decision structures (if, switch case). Input and output will still be necessary, preferably using scanf and printf.
You might also want to review your basic math - addition, subtraction, multiplication, division. Maybe some advanced operations like exponentiation, factorial, logarithms.
There'll be a lot of code for you to work off of if you wish, so bring your reading glasses, and practice interpreting code if you haven't tried reading and understanding another person's code before.
Be sure to get there early, there's a good chance the quiz will take you the full 5 minutes, and you want to be sure you have the full time to complete the lab.
We want to finish dealing with login issues, so be sure you either know your cs username and password, or get here early to try it out so we can resolve issues without cutting into your work time.