Practice exams seem to be in short supply for the SharePoint MCTS exams, especially the dev ones.
I took my MCTS Moss & WSS admin ones last year after attending the Combined Knowledge course and passed both comfortably, but I also work daily with the product which helps.
Book wise, I'd recommend the Administrators bible by Bill English as it covers all the exam material, but it's NOT a training guide.
www.myfatblog.co.ukMCTS: WSS 3.0
MCTS: MOSS 2007