The National Council of Examiners for Engineering and Surveying (NCEES) is a nonprofit organization providing professional licensure for engineers and surveyors in the United States of America. The NCEES website provides exam information, options to purchase sample exam questions, and other free reference materials.
Fundamentals of Engineering FE Civil All-in-One Exam Guide by 
Civil Engineering All-In-One PE Exam Guide: Breadth and Depth, Third Edition by 
FE Review Manual by 
FE Civil Review by 
FE Electrical and Computer Practice Problems by 
FE Mechanical Review Manual by 
FE Mechanical Practice Problems by 
FE Other Disciplines Review Manual by 
FE Other Disciplines Practice Problems by