Just understand the nursing process. The nursing process is basically the same as any rational thought process. (ie: u=you can't make a plan before you assess for a problem) This is why assessment is always the first thing you do.
This is how they may ask the questions:
You are a nurse in a med/surg floor. Your patient tells you that she has been experiencing epigastric pain, which she describes as "really intense heartburn." What is your action?
a. Call the doctor immediately as it could be an MI
b. place client on O2 2L/min Nasal Canula
c. Listen for S1 and S2 heart sounds
d. Chart the client symptoms.
This is a bad example that I wrote but this is the kinda stuff they asked us. Always assess first, so listen for heart sounds. You need to assess before you plan (administering O2). Don't call the MD unless blood is squirting out of her eyes!
This is how you to be thinking.
Hope that somehow helps