We typically recommend doing the drills first - to warm up.
Drills help you build the skills to answer your homework more effectively and efficiently. They emphasize concepts that will be used in the homework and give you more practice with fundamentals such as conditional diagramming, writing out logic game rules, and analyzing arguments. Thus, we suggest using the drills as a quick review after completing the lesson and a warm-up tool before starting the homework.
But you can do the drills last - to cool down.
Some students prefer to complete the homework first, especially if they like to focus on going through untimed LSAT questions. You're more than welcome to use this reverse method and go back to the drills once you feel comfortable applying timing pressure. This is a great way to drill down on your understanding of the concepts!