Learning to spell from sound, not from copying
Copying is not practice
Ask a child to write each spelling word out five times and you will get twenty-five neat words and very little learning. It is not that the child was lazy. It is that copying asks the eye and the hand to do a job the memory was supposed to do. The word is on the page the whole time, so nothing is ever retrieved, and retrieval is the part that builds the memory.
You can watch this happen. A child who has just written "necessary" five times correctly will often get it wrong twenty minutes later when you ask for it cold. Nothing went in, because nothing was ever taken out.
The alternative is simple enough to describe in one sentence: your child should hear the word, write it from memory, and only then see the correct spelling. That order is the whole method. Everything else is detail.
What hearing a word first actually trains
Spelling from sound asks a child to do three things in quick succession, and each of them matters.
The first is segmenting: breaking a word they have heard into its separate sounds, in order. A child who writes "cap" for "clap" has heard the word perfectly well and failed at this step, which is a different problem from not knowing the spelling, and it is fixed differently too.
The second is mapping each sound to letters, which is where English gets difficult and where most classroom teaching is aimed. The same sound can be spelt several ways, and knowing which one belongs in this particular word is what a spelling list is really for.
The third is checking the result against a remembered picture of the word. This is the step that catches the silent letters and the irregular words, the ones no amount of sounding out will ever produce. "Debt" has to look right, because it will never sound right.
Copying exercises none of these three. Hearing a word and writing it exercises all of them, every single time.
Why the word must stay hidden
The hardest part of doing this at home is keeping the word out of sight. A spelling list sitting face-up on the table is read, not recalled, and a child under any pressure will glance at it. Once they have glanced, the attempt is worthless as evidence: you no longer know whether they could have spelt it.
This is also what makes a listening drill honest. If your child never sees the word before they write it, then every attempt is real evidence, and the list of misses you are left with at the end is a true picture of what they cannot yet do. That list is the most useful thing in the whole exercise, and it only exists if the word stayed hidden.
Spelling Stars is built around exactly that constraint. Your child hears the word, as often as they like, and types or builds it without the word ever appearing on the screen; it appears only after the attempt is in. Nothing about the drill depends on an adult resisting the urge to help.
Saying it the way the test will say it
When you read a word aloud, say it at ordinary speed, in the accent your family actually uses. It is tempting to help by over-pronouncing the silent letter in "listen" or by stretching a vowel until it gives the spelling away, but that teaches your child to spell a word nobody says. The classroom test will be read at normal speed by a teacher who is not trying to help.
If your child cannot catch the word, repeat it identically rather than more clearly, and let them ask for it again as many times as they need. Repetition at the same speed trains listening. A slower, clearer version trains nothing they can use.
It is also worth putting the word in a short sentence when it has a twin, because "their" and "there" cannot be told apart by sound at all. That is a meaning problem wearing a spelling problem's clothes, and it needs a sentence to solve.
Where writing by hand still wins
None of this argues against handwriting. Forming the letters yourself adds a motor trace to the memory, and for a younger child there is good reason to do at least some of the week's practice on paper.
The useful division is that paper is good for the fixing and a listening drill is good for the finding. Use a drill to discover, honestly and quickly, which words your child cannot spell; use pencil and paper to repair the handful that failed. Trying to do the finding on paper is what turns a ten-minute job into a whole evening.