The short answer on English Tutor
Most explanations of English Tutor start with a definition and stop there. A definition is the least useful part, so this starts with what it looks like in practice instead.
Two words, two jobs: English names the approach and Tutor names who or what it is for. Most confusion comes from treating them as one idea.
Where this usually goes wrong is that re-reading notes is studying — a mistake that is invisible until something unfamiliar turns up.
Why tutor is the part that matters
The reason undergraduates, postgraduates and adult learners returning to study end up here is rarely academic curiosity. It is usually a specific stuck point, and English Tutor turns out to be the name for it.
Once you separate the english framing from the tutor practice, the idea gets considerably more useful and considerably less quotable.
Two questions to work with
Open with If this question appeared on the exam in a different form, would you still recognise it? — a diagnostic, not a test.
Follow with Which step in your working are you least able to justify?, which is where the actual thinking happens.
Making it routine
In practice this means closing the book and reconstructing the argument from memory, then checking only what failed.
The signal to watch for is the student can predict which part of a question is the trap.
Next steps
The natural continuation from here is the advanced guide on question ladders, then a session on the paper you are preparing for.