I'm looking for a new job as a software developer and I applied to many job for which the stack necessary involves languages I'm not familiar with, yet I'm confident I can learn in time.
For one of my applications, I've got a respone with a test assignment with said stacks. I could make some progress by learning about it, but then I realized I can't finish in time; for unrelated reasons, during the next week, I can't do any programming at all, I'll be away.
What's the professional and/or ethical way to tell I'd prefer to not solve the assignment, and thus, to step back from my application?