I mean shuffle the review cards. Presenting them in order I think is part of the magic to these books (RTH and RTK share an author). It is the default behavior of Anki, if you add them all at the same time. It gets more difficult when you don't have all 1500 and start with, say, 100 and then build as you go (you don't want review time to be one month away for the first hundred characters just because you added them first). Because there is pronunciation and meaning clues to the radicals, the shuffle matters for long term memory. But the ordered helps get them into short term memory and to passively learn radical structures.