Family naturalization questions

Congratulations! IMHO that is the most significant step.
About the test, I am sure it is doable. In my case, I know Chinese even less than you describe but I made just 1 error at my exam. So, I would suggest you:

  1. Be prepared for written test (not oral).
  2. Use Cracking the Naturalization Language Exam - A Guide by Northcoast_Surfer. Yes, it is old but still very useful!!!
  3. Use this Practice link to verify your answers

In my case, I spent about 2 weeks for practice and then successfully passed from the 1st attempt. Good luck!

P.S. By the way, Here is the updated questions with my comments which can help to memorize.
P.P.S. Here is original manual by Northcoast_Surfer (it should be read first).