The Speaking test is more realistic than it looks. Picture yourself arriving at a party.
Part 1 is the greeting
Short, simple exchanges. Where are you from? Tell me about your hometown. What's your favourite food?
Exactly what happens when you walk into an event: you start with small talk. That is Part 1.
Part 2 is the story
Slightly deeper questions where you recount something.
Obviously nobody in real life says describe the most memorable trip of your life. But people do ask have you ever been to Paris?
Or the group is talking about Paris, and you have a minute or so to describe your own trip. If something interesting happened and you want to tell it, that is Speaking Part 2.
Part 3 is what turns acquaintances into friends
This is the discussion: questions and answers on broader, more social topics, with a bit of argument and a bit of personal opinion in it.
It is also the most important part outside the exam room. At a party, meeting people, this is the part that lets you get past the surface.
Becoming close to someone requires talking about more than where you are from and what you like to eat.
Why this framing helps
Once you see the test as a party rather than an exam, those three parts stop being three question types to memorise. They are the three natural stages of getting to know anyone.
And practising them means practising exactly what you need outside the exam room.