Is there any way to study only a small list that's within a larger list in the Advanced Study mode on mobile devices? I find it's much easier to organize huge course lists by making a big list with a bunch of smaller sublists, but it seems that I'm unable to study each sublist (which are each up to 200 words) individually.

You can study a single list via Advanced Study, however not an individual list section. You can work around this though by creating a new list, and then exporting the words from a particular section into the new list, so you could study that new list that has just the words from the single section in Advanced Study. If you go to a list, viewing it's contents, and then click the checkbox to select all of the words, you can select "Add to list" under the Word Actions.

Yeah, I am hoping for a feature that avoids this workaround. I have some lists with up to 80 subsections. I don't want to have to do a huge workaround on the computer to study each list before a quiz or something.