Ah, sorry for my confusion.
Hopefully the purpose of the different kick drills is obvious, as well as the sighting and bilateral breathing drills.
Catch up, half catch up, and single arm drills give you chance to work on synchronizing your breath / stroke rhythm, focus on one arm at a time, and position your arm before the catch. They also help you get used to having a streamlined body, particularly how the forward arm flows into the rest of the body.
Fingertips and thumbs is really two drills… fingertips helps you develop a higher elbow recovery (while keeping the hand low), and thumbs is all about developing a full stroke and not stopping your stroke early.
Fists helps you develop a catch and stroke with your whole forearm, “early vertical forearm” or “high elbow” catch.
The sculling drills help you develop a “feel” for the water and your drag in it.