The short answer
Why memorising backfires
A word-perfect script feels safe. It is the opposite. Three things go wrong, reliably, and every interviewer has seen all three.
What to do instead
Prepare the substance, not the sentences. For each answer, know three things cold: the example you want to use, the one number or outcome that makes it land, and the single point you want to leave them with. Those are cues — and cues pull the rest of the answer back far more reliably than a script you have to reproduce exactly.
Then rehearse it the right way: say it out loud a few times, letting the words come out a little differently each pass. You are training the shapeuntil it’s familiar, not drilling a fixed wording until it’s rigid. Familiar survives pressure; rigid does not. (More on this in practising out loud and sounding natural.)
The one thing worth learning nearly word for word
There is a narrow exception: your opening line for “tell me about yourself”. The first fifteen seconds are when nerves peak and a steady start settles you. Learn that opening close to verbatim if it helps — then let everything after it breathe.
Common mistakes
Writing answers as full paragraphs, then trying to hold them.
Instead: Write bullet cues instead — the example, the number, the point. Cues are what you can actually recall under pressure.
Treating “don’t memorise” as “don’t prepare.”
Instead: Prepare hard — just prepare material to draw on, not lines to recite. Flexible and ready is the goal.
Practising the exact same wording every time.
Instead: Vary the words on each pass. That builds the flexibility that keeps you from sounding rehearsed.