smalltimeboss

As somebody who regularly employs developers, and being a developer myself, may I suggest you put your Saturdays' effort into an open source github repo or something similar? Sure, this takes time too, but afterwards you can just point your prospective employer to your superbly styled and documented code on github. Both parties win: you don't have to spend time on stupid exercises anymore, they can get a very decent impression of your coding skills.

[Edit: corrected typo]