Yes, the old ones will still show up for review, even after adding next parts.
In the first steps I knew most of the vocabs on beforehand. In step 3 and 4 the difficulty suddenly increases a lot though. But even then, most of the vocabs I learned just using the site, but for some of the words that gave me extra problems I also used pen and paper, making short wordlists and studying them separately to make them stick better.
I was almost done with RTK when starting the core 2000, so most of the kanjis were already familiar, so didn't feel a need to writing them down.
In the first steps I knew most of the vocabs on beforehand. In step 3 and 4 the difficulty suddenly increases a lot though. But even then, most of the vocabs I learned just using the site, but for some of the words that gave me extra problems I also used pen and paper, making short wordlists and studying them separately to make them stick better.
I was almost done with RTK when starting the core 2000, so most of the kanjis were already familiar, so didn't feel a need to writing them down.
Edited: 2011-01-11, 7:23 pm