I refuse outright to do this kind of thing... mostly, it's because I fail badly ! - I do fine in real jobs, but when it comes to tests and homework, I tend to not get the job. Also... I could be applying for other jobs in that time or doing.. you know, anything else - lying in bed doing nothing for instance.

Seriously, this trend can go fuck itself... the last time an recruiter told me I had to write 100 words about 12 different skills I told her no, and hung up - only to send her a ranty email about how stupid the idea is.