The Ted Madson course is good.
http://www.lss-seminars.com/ncees.html
I second the Surveyor Reference Manual, and any of the PPI materials, and get the lastest FS Exam booklet from NCEES.
FS was heavy on the Math side. They like horizontal and vertical curves for some reason. ????
Brush up on your mathematics, then take the course if you decide to.
You need to develop an intuition on these tests. They can, and will present anything to you.
You MUST be prepared. Do not skip any sections in your prep materials. Also try not to rush into a test date.
Work in a efficient manner, and you’ll know when you’re ready. It consumed me. Stay focused!
Good luck. Takes work. But anything worth having…… is worth earning.