surely your class must have done this prac, maybe u were away when they did it. Ask someone in your class if u can have a look at their prac write-up. Also, study circuit diagrams in your textbook, this will help.
Maybe u could ask your teacher if u could go into the lab after school or something to practice setting up circuits. Coz u seriously dont want to walk into the prac test having never set up a circuit, u might not know how to set up the required circuit properly.
At the very least, u should know the theory backwards. Aim, materials, method, discussion, safety (eg electric shock from power supply) and sources of error (eg experimental errors, parallax errors etc) and how to reduce these errors are all things they can ask.
Good luck!