As explained here, your warmups should not be a subset based on your own choosing - rather, you pick two or three randomly from a pool of all the exercises you've been introduced to in the course thus far (not including those in the lesson/challenge you're currently working on) at the beginning of each sitting.

If you'd like further feedback on any later attempts at the exercises, I'd recommend posting the work on our discord chat server, where we have channels devoted to each lesson, and students critique each others' work.