The thing that Rocket Languages doesn't tell us but we all seem to discover over time is that for every "Interactive Audio" lesson (1.1, 1.2, 1.3, ...) there are one (and sometimes two) corresponding "Language & Culture" lessons (1.5, 1.6, 1.7, ...). So, a logical progression is to do them in pairs, specifically do the first IA lesson (1.1) along with the first LC lesson (1.5) followed by the next IA lesson (1.2) along with the next LC lesson (1.6), and so on.
I add another wrinkle and prefer to do the LC lesson first before doing the IA lesson.
For languages like Arabic and Japanese where the writing tests require knowledge of the writing script (Hiragana in Japanese), you may want defer working through those tests until you have worked through the writing lessons.
The nice thing is we can do whatever suits us.
Still, I suggest Rocket Languages change the recommended order to go IA lesson, then LC lesson, then next IA lesson and so on. Right now it suggest you complete all IA lessons on that row followed by all LC lessons on that row.