When to use the drill sets?

I'm currently working my way through the core curriculum in the hopes of taking the June 2023 LSAT. I've only been doing 1-2 of the problem sets after each section so that I can save them for later in case I need more help in a certain area (once I begin taking PTs). I've noticed that a lot of these problem sets, however, are in the "easy" range based on the stats that accompany them. Should I be taking the drills (which appear to have varying difficulty) now, or save these for when I start taking the PTs? Thanks for any insight! :)