Unit Pre-Test

We took this units pretest today...and I am quite worried. I did not know any of the subject material and I guessed in the entire test. However, all of the questions I didn't know were very similar. Hopefully, with some slight instruction I will understand. My grade in chemistry has slowly been rising and I do not want this unit to be what brings me down. I will try my best, and I can only hope it will be good enough!