If you do not know anything about FE Exam, this article is a good place to start:

• FE Exam stands for Fundamentals of Engineering exam. It is the first step in gaining Professional Engineering (PE) licensure. It is to be given as a proof of proficiency of your engineering knowledge gained in your four-year engineering degree.
• It is conducted by NCEES, all year long. It is a computerized test. It is 6 hours long and has 110 questions.
• You can take the exam in one of the seven disciplines.
  • Civil Engineering,
  • Chemical Engineering,
  • Environmental Engineering,
  • Industrial and Systems Engineering,
  • Mechanical Engineering,
  • Electrical and Computer Engineering,
  • Other Engineering
• It is NOT necessary to take the exam in your discipline. e.g. If you are Mechanical Engineer, you can take exam Civil engineering, provided you are comfortable with those topics.
• You are allowed to use a reference handbook during exam. While preparing for your studies, this handbook can be downloaded from the NCEES website.
• You are also allowed to use scientific calculators, the list of approved models are listed on the NCEES website.
• Once you pass the FE exam, you qualify for the next level, Professional Engineering (PE) Exam. Passing PE exam allows you to get a PE license, which, in turn, allows you to approve building, electrical or Mechanical plans. PE licensure is a symbol of expertise in your field.

Still have questions? Please refer this article which presents this information in Q&A format.