以前・どころではない・はおろか: the difference
以前N1
Meaning
Before, Not even, Before even, Precede, Far from
Past papers
Example
ポイ捨ては法律以前の道義的な問題だ。
When it comes to littering, before even the law, it is a moral issue.
どころではないN2
Meaning
This is not the time for…, Far from, Out of the question
Past papers
Tested 2 times in past papers
Example
休みの日はたくさん寝たい。レジャーどころではない。
On my day off, I want to sleep a lot. Leisure activities are out of the question.
はおろかN1
Meaning
Let alone, Much less, Needless to say, Not to mention, Not only but also
Past papers
Example
「ルームメイトはオムライスはおろか、おにぎりさえ作れない。」
'My roommate cannot even make onigiri, let alone omurice.'
How to tell them apart
「〜以前の問題だ」: doesn't even reach the minimum bar, so further demands are out of the question.
「〜どころではない」: the situation is urgent or you are too busy, so there is no room to do it.
「〜はおろか」: can't do even the basics, let alone anything advanced.