Prepubs I read like a serialisation so it's a bit every week, then two or three week gap between volumes. I don't need reminding in that time frame.
For every JNC series I buy Premium ePubs for, I don't read the prepubs cause I have too much to read as it is. For full volumes my process is when a new volume comes out I send it to my phone & reread the previous volume to remind me what was going on, then read the new volume. Another 2-3mths later I do the same with the next volume release, so I end up reading everything twice within about the time it takes JNC to release a new volume.
I do the same thing with the LNs from Yen etc, even though the gap between volumes is longer one volume behind then the new one seems to still work for me.
Very occasionally I'll reread an entire series if I don't have much to read, but as I'm buying more and more series these days I'm getting less chance to do that.