Does anyone know of any good problem solving books on strings, branes and/or loop quantum qravity? I am looking for something that has a lot of actual solved problems, something in the spirit of Schaum's Outline Series, Zetteli's book on QM, or Peskin and Schroeder's book on QFT. Any information would be greatly appreciated. P.S. Downloadable PDFs or class notes are to be included in this search.