I was in the similar situation. I was converting from F1 CPT to H1. I did collect these materials myself, and have later posted in a blog.

The sample Questions are located at:
http://sanjaal.com/h1b/wp/2008/09/15/h1b-sample-questions-web-view/

The list of required documents:
http://sanjaal.com/h1b/wp/2009/07/14/list-of-documents-required-for-h1b-and-h4visa-stamping/

Also make sure you take the Employment permit from Nepal. Else they will send you back from the airport. Carry the employment permit related documents (insurance, medical doc - you will have to prepare them for the permit)  in your hand carry to be shown at the airport  (even if your passport is stamped with the employment sticker, they will re-verify the documents at the immigration at the airport.
http://sanjaal.com/h1b/wp/2009/03/29/labor-permit-after-h1-stamping-from-nepal/

Hope you find the info useful.