Practice and "doing a mock with a friend" are not the same thing
Everyone says do mock interviews. Most people then do them in a way that barely helps: a casual run-through with a friend who goes easy on you, no time pressure, lots of "you basically had it." That is not practice. That is rehearsing being comfortable, which is the opposite of what the real interview will feel like.
A mock interview done right is the highest-leverage prep there is, because it trains the exact skill the real round tests under the exact conditions. Here is the difference between going through the motions and actually getting better.
Make it uncomfortable on purpose
The whole point is to feel the pressure before it counts. That means real conditions: a timer, a real problem you have not seen, and no peeking at the answer when you get stuck. The discomfort is the training. If your mock feels relaxed, it is not preparing you for a room that will not be.
This is also why a friend who likes you is often the wrong partner. They soften the hard parts and reassure you when you stumble, which feels nice and teaches you nothing. You want a mock that is at least as hard as the real thing, run by someone or something that will not let you off the hook.
The feedback is the entire point
The interview itself is only half of it. The value is in what you learn afterward, and most people skip this part entirely. They finish the mock, feel relieved, and move on.
Instead, after every mock, get specific feedback against the things real interviewers actually score:
- Did you scope and ask clarifying questions before diving in?
- Did you communicate your reasoning out loud, or go silent?
- Did you handle being stuck well, or freeze?
- Was your final answer correct, and could you reason about its tradeoffs?
Vague feedback like "that was pretty good" is useless. You want signal-by-signal, dimensioned feedback that tells you exactly where you lost points, because that is the list of things to fix before the next one.
Treat it like a training loop, not a one-off
One mock the night before is cramming. A real prep practice is a loop: do a mock, get specific feedback, work on the one or two weakest dimensions, do another mock, measure whether they improved. Progress comes from the loop, not from any single session.
Track your own trend. If your "going silent when stuck" problem shows up in mock one and mock four, you have not actually fixed it, and now you know to target it directly. The point of repeated mocks is to turn vague nerves into a specific, shrinking list of weaknesses.
Why this beats reading
You cannot read your way to a good interview any more than you can read your way to a good free throw. The interview is a performance under pressure, and performances improve with reps and feedback, not with more theory. Whether you use a structured platform, a tough peer, or an AI interviewer that grades you against a real rubric, the formula is the same: make it hard, get specific feedback, and run the loop until the weak spots close.