The FE exam can be take betwen the following time frames. Dates and time differ for each resting location.
Please visit https://ncees.org/exams/fe-exam/ to find out dates and times at a location near you.
January through March
April through June
July through September
October through December
You can only attempt the FE Exam once within each of the following periods:
January through March
April through June
July through September
October through December
So if you take it in January and fail, the earliest you can take it again is April. If you take it in April and fail again, then you have to wait until July for another attempt.
Additionally, if you fail the FE Exam three times within any rolling 12-month period, you cannot register for it again until the point when you’ve only failed it twice in the previous 12 months.