When I took the test (several years ago), a big part was load calculations (per NEC 220). Another part was the WAC rules related to licensing, fees, fines, and disciplinary actions. Another was safety rules (e.g., ladders, scaffolding, lock-out-tag-out, etc.). And of course, anything in the NEC itself is fair game. Good luck. However, I took the general (01) exam, not the limited energy version. So I really can't tell you what will be different in your exam.