Re: Yellow Belt Techiques
I did five throws for my first test (fifth kyu for us; we don't use colored belts), plus kokyu dosa and some one-person exercises. When I trained briefly at another dojo, their fifth kyus asked me about testing and then had the pleasure of explaining to me that *they* did thirty different throws for fifth. (It was true, too. Training there, I constantly felt as though my head was going to explode from information overload.)
So the answer to your question is "It really, really depends on the dojo." Best idea is to ask your fellow students or teachers--either they'll show you or they'll have something to recommend. A lot of my classmates use Kashiwaya sensei's video tapes to study the testing criteria, though I haven't seen them yet as I don't have a VCR.