There is a time when 'bad parenting' is just what they need
The first rule of parenting should be: not too many rules. I won't say that philosophy has served me perfectly over the decades (my eldest is 28; my youngest 18), but as a general rule of thumb it hasn't let me down too often.
The experts and gurus (some of whom have never fought in the parenting trenches) get all touchy-feely when it comes to giving advice about The Big Exam.
A lot of what they say makes sense, of course. But the tick-the-box advice spreadsheet has never overly impressed me.