I don't think the Course Contributors have any control over the order that things appear. However, if you'd like you can sign up free with elon.io. They have a list of the vocab for each Duo lesson if you want to go through them before you start a new skill here. :-)
They also use SRS (spaced repetition system), which helps you put new words into your long-term memory. And Duo will allow you to re-enforce and practice grammar /context. In my opinion, these two sites make a good pair.