I think you are referring to the "Nursing Jurisprudence Exam." http://www.bon.state.tx.us/olv/je.html
It's specific to TX and it's easy. All newly licensed nurses in TX, either by exam or endorsement, are required to take it. It doesn't take 2 hours to complete and you are able to freely browse throught the BON website and NPA documents in another window to answer the questions. Nothing you need to study really, it's mostly common sense type questions.
Here's an outline of the content with a reference to where to source the answers from within the NPA and rules documents: http://www.bon.state.tx.us/olv/pdfs/...Table-List.pdf