(15.4) ​Ich weiss ja noch nicht einmal, was ich nächste Woche mache,

I found the following links with google
https://www.dict.cc/?s=noch+nicht+einmal
https://www.linguee.de/deutsch-englisch/uebersetzung/noch+nicht+einmal.html
https://context.reverso.net/%C3%BCbersetzung/deutsch-englisch/es+noch+nicht+einmal

so it looks as though einmal has its normal meaning and noch nicht einmal is a recognised german expression.

Hi sfpugh, 

thanks for asking this question. 
As you've already found out (I think), noch nicht einmal can be translated with "not even". 
The einmal is not necessary though. You could also say: Ich weiß noch nicht, was ich nächste Woche mache.  The einmal is a particle that you can stress the "not even" with. 

I hope that helps. 

Liebe Grüße, 
Leah von Rocket Languages

Thanks, so einmal is functioning as a modal particle here as I first suspected.
And yes , the links I posted do give "not even" as a translation, but I didn't realise that you could just use noch nicht, which I think usually means not yet.

Well done for sorting that out. The set expressions still get me almost every time! What doesn't help is that I tend to remember things in the terms that I first learned them, so 'noch nich' for me will always be 'still not' rather than not yet. 

If a phrase translates into completely meaningless gibberish I start looking for set expressions but they aren't always very obvious. I don't even want to consider what will happen when I add more idioms into the mix! 

One can also hear "mal" instead of "einmal" on the street.  Germans often add unnecessary words for expressive quality.