There are apps that ask all questions randomly, which are free. Make use of them.
Don't overspeak. Answer only what is expected of you.
In my experience, the officer did a simple page turn of my evidence and had no questions. Context: DV winner, who divorced 3 years after moving to the US, had been an LPR for 5 years.
When you are approved - and I'm assuming you will be because good people always prevail - don't be afraid to release your emotion. I bawled when he asked me what version of my name I wanted on my Naturalization certificate. His only words were 'we are happy to have you'.
Go forth and be a proud naturalized American. There are only a handful of moments (including the birth of my babies) that I rank higher than taking the oath. I commemorate oath day each year with a serving of hush puppies and quiet gratitude to this most amazing of countries.