That’s the way to go. Usually when you level up, you will always get a huge amount of lessons. Those consists of old level Vocabulary, new level Kanji and new level Radicals.
I’m doing average speed at the moment (10 days/levels), and I always do all the radical first, because they are easy, and then 15 kanji and 15 vocab each days until all the kanji is done, and then all the vocab.
If you want to maximize speed, one thing that can be improve is to take all the radical AND kanji in the first day, then just 20 vocabs a days.