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Exam-day strategy

Knowing the material gets you most of the way. The last stretch comes from pacing, using the handbook fast, and not losing points to units.

Pace

FE: ≈ 2.9 min per question110 questions in about 5 h 20 min, split into two sections with an optional break between them

Two passes. First pass: answer everything you can do in under the average time and flag the rest. Second pass: return to flagged items.
Never leave a blank. There is no penalty for a wrong answer.
Read the last line of the question first so you know what quantity and units are wanted before you read the setup.
Check the answer choices for spread. If they differ by a factor of 10 or 144 or 32.2, the question is testing units, not physics.

The handbook is the only reference allowed, so learn where things are rather than memorizing them. Practice every module with the same PDF open.
Use the search box with distinctive words (“Dittus”, “Fenske”, “Ergun”, “NPSH”). Searching a single symbol rarely works.
The handbook's symbols sometimes differ from your textbook's. When a formula looks unfamiliar, read its nomenclature line before you plug in.
For the PE, also learn which design standards are provided and what each one covers, so you are not hunting for one during the exam.

Trap	Fix
g_c	In USCS, mass in lbm and force in lbf: g_c = 32.174 lbm·ft/(lbf·s²). Bernoulli and pump work need it.
psig vs. psia	Gas laws and vapor pressure use absolute pressure. Add 14.696 psi.
°F vs. °R, °C vs. K	Absolute temperature for gas laws, Arrhenius, radiation. °R = °F + 459.67; K = °C + 273.15. Temperature differences are the same size in °C and K.
Btu vs. ft·lbf	1 Btu = 778.17 ft·lbf. Mixing them in an energy balance is a classic distractor.
Mass vs. mole basis	Heat capacities, enthalpies and reaction rates may be per mass or per mole. Check before multiplying.
ln vs. log₁₀	Arrhenius, Antoine and NTU formulas each use a specific log. Antoine constants in particular come in both forms.

Use only an NCEES-approved model and practice on that exact unit. The approved list has been limited to specific Casio fx-115 / fx-991, HP 33s / 35s and TI-30X / TI-36X models; check the current NCEES calculator policy before you buy.
Learn your calculator's equation solver and its unit-conversion features. They save minutes on iterative problems such as Colebrook or flash calculations.
Bring the ID that matches your NCEES account exactly and arrive at Pearson VUE about 30 minutes early. A scratch board and marker are provided.
Results usually arrive within about 7 to 10 days.

FE Reference Handbook: free download from your MyNCEES account. Study with this exact version.
NCEES FE Chemical Practice Exam: the official sample, sold by NCEES. Save it for week 12.
PE Chemical Reference Handbook and the list of design standards: from NCEES, for the PE.
NCEES PE Chemical Practice Exam: save it for your full mock.
Optional: a commercial review manual and a book of practice problems for extra volume.