If you got a high ATAR (say 98+), would it be better to not advertise this (obviously don't lie, but just don't mention it), as fast food restaurants like Maccas and KFC would believe this means you would probably prioritise uni/study over them (which is probably true)? Thanks
I haven't come across anyone who has put their ATAR on their resume or spoken about it in their job interview...you don't get interrogated about your school scores when you have a job interview - they care more about your ability to serve customers, follow orders, work hard (although I guess a high ATAR shows that you can work hard - but a lower ATAR doesn't mean that you're not a hard worker either), etc.
You'll likely be asked about your availability anyway in online applications/job interviews anyway, which is when you can let them know about commitments that you have - employers are generally understanding of everyone (to a degree of course).
Really, the only time I think your ATAR will have negative connotations is if you use it to brag, etc.
Overall, it's just not relevant to work. What matters to employers is that you've completed VCE