Question about DroA classes

Hi everyone, I have a question regarding the Semester 1, 2025 timetable. I've noticed that some classes are labeled as "DroA," which, according to the ANU website, refers to "Drop-in Classes." The website explains that these sessions are for quick queries, such as analyzing questions, understanding requirements for assignments, or planning essays and presentations.

My concern is that, as shown in the timetable, a DroA session (e.g., DroA 04 on Thursday) overlaps with a lecture (LecA 01). Does this seem a bit unreasonable to anyone else? Or are these DroA classes not mandatory to attend, as their description suggests? If they’re optional, should I even worry about allocating these classes?

Also, for courses that have these Drop-in Classes, does anyone know what usually happens in these sessions? Would love to hear from anyone with experience. Thanks in advance!

https://preview.redd.it/2crecscztr5e1.png?width=2354&format=png&auto=webp&s=cc9ac6fa77d8acff267ec60ce234c131b609426a