Practice exam review and test-day strategy

Two weeks before her exam, Tamika sat a full timed practice test at the kitchen table on a Saturday morning, with her tabbed 2020 code book, a practice version of the on-screen calculator and a kitchen timer set to three hours. She finished with eighteen minutes left and scored 75. That was a pass, but not by enough to feel safe. More useful than the score was the pattern of her misses: four of her thirteen wrong answers were grounding and bonding questions she had answered from memory without opening the book, and three were questions she had run out of time to check. This lesson turns that kind of review into a plan, and then walks through exam day.

The lesson has three parts: a review of the Missouri-specific facts from Lessons 1 to 11 that candidates and exam writers both focus on, a method for working code questions under time pressure, and a test-day routine built around the testing company's bulletin. The practice questions here are written for this course; they do not reproduce questions from any real exam, and the code is referred to by article number only.

What the exam measures

The statewide-accepted master exam, as Lesson 4 explained, is an open book test of the National Electrical Code in the 2017 or 2020 edition, with ten subject areas and a cut score of 70. St. Louis County's, Kansas City's and the City of St. Louis's exams can also test local requirements. A candidate who will take both a code exam and a local exam should prepare for two kinds of questions: code questions answered with the book, and law and business questions answered from knowledge of the jurisdiction's rules.

Missouri facts worth knowing cold

Law and business questions reward recall. The facts below are the ones this course flagged most often; each comes from the lesson indicated.

Reviewing a practice test

A practice score matters less than the reasons for each miss. Tamika sorted her thirteen misses into three causes: did not know where to look, found the rule but misread a condition or exception, and ran out of time. Each cause has its own fix. For where to look, practice locating rules by tab and index without answering the question. For misreading, slow down on the last step and reread the section's conditions. For time, drill the clock checkpoints below.

# Sorting practice-test misses by cause and subject (Tamika's data, illustrative)
misses = [
    ("grounding", "answered from memory"), ("grounding", "answered from memory"),
    ("grounding", "misread exception"), ("grounding", "answered from memory"),
    ("calculations", "time"), ("calculations", "time"), ("calculations", "misread exception"),
    ("conductors", "could not find"), ("conductors", "time"),
    ("special occupancies", "could not find"), ("special occupancies", "misread exception"),
    ("motors", "misread exception"), ("raceways", "could not find"),
]
from collections import Counter
by_cause = Counter(c for _, c in misses)
by_subject = Counter(s for s, _ in misses)
print("By cause:", dict(by_cause))
print("By subject:", dict(by_subject))
score = 51 - len(misses)
print(f"Correct: {score} of 51 -> scaled {round(100 * score / 51)}")

By cause: {'answered from memory': 3, 'misread exception': 4, 'time': 3, 'could not find': 3}
By subject: {'grounding': 4, 'calculations': 3, 'conductors': 2, 'special occupancies': 2, 'motors': 1, 'raceways': 1}
Correct: 38 of 51 -> scaled 75

The data told Tamika two things. Answering from memory cost her more than any other habit, so on exam day she would open the book for every grounding question, even ones she felt sure of. And calculations ran long, so she would flag any calculation that passed six minutes and return to it.

Working a code question

A reliable method for open book code questions:

• Read the question stem twice and underline, mentally, the occupancy, the equipment, the voltage and any numbers.
• Decide which article governs before turning pages. Grounding goes to Article 250, branch circuits to 210, feeders to 215, services to 230, conductors to 310, motors to 430, and so on.
• Use the tab to reach the article, then the article's internal structure, or the index if needed, to find the section.
• Read the rule and its exceptions, and check that the question's facts fit the rule's scope.
• Answer, then check that the option you chose matches the exact condition in the question, such as a minimum versus a maximum.

Many wrong options on code exams are correct for a slightly different condition: the right number for copper when the question says aluminum, the right rule for a dwelling when the question is about a commercial kitchen. The last step of the method catches those.

Managing the clock

The 2020 version gives 180 minutes for 51 questions. Tamika's plan was to work through all questions once, answering quick ones and flagging long ones, keep twenty minutes in reserve, and use checkpoints: question 17 by about minute 53, question 34 by about minute 107, and all 51 by minute 160. If she was behind at a checkpoint, she would flag the next long calculation and move on.

# Clock checkpoints for a three-hour exam
def checkpoints(questions, minutes, reserve, parts=3):
    per_q = (minutes - reserve) / questions
    step = questions // parts
    return [(k * step if k < parts else questions,
             round((k * step if k < parts else questions) * per_q)) for k in range(1, parts + 1)]

for version, n in (("2017", 60), ("2020", 51)):
    marks = checkpoints(n, 180, 20)
    print(version + ": " + "; ".join(f"question {q} by minute {m}" for q, m in marks))

2017: question 20 by minute 53; question 40 by minute 107; question 60 by minute 160
2020: question 17 by minute 53; question 34 by minute 107; question 51 by minute 160

Never leave a question blank. The score counts correct answers, and the bulletins do not describe any penalty for a wrong answer, so an educated guess on a flagged question is better than nothing. Eliminate options that conflict with the facts and choose among the rest.

The last two weeks

Tamika's final plan had four parts. First, one hour each weekday on her weakest subject areas from the score report of her practice test, opening the book for every question. Second, one more timed full practice test the Saturday before the exam, with the same checkpoints. Third, a final check of her code book against the bulletin rules: permanent tabs only, no sticky notes, no loose sheets, no pencil marks, and no pen notes unless the division had confirmed they were allowed. Fourth, a review of the Missouri facts table above for the law and business questions she would face on the county exam later.

Exam day

The testing company's bulletin sets the rules for the day, and following them removes avoidable risk.

• Bring current, valid, government-issued photo ID with the name exactly as booked.
• Arrive early; doors open before the appointment, and late arrivals forfeit the fee.
• Bring only the permitted reference, prepared to the bulletin's rules; leave the phone, watch and bag where staff direct.
• Use the on-screen calculator you practiced with; no other calculator is permitted.
• Do not mark the book during the exam.
• Read the score report before leaving, and keep it; it shows performance by subject area if a retake is needed.

Tamika's exam was on a Saturday in St. Peters. She arrived forty minutes early, sat in her truck reviewing the Missouri facts table for ten minutes, and walked in with her book, her driver's license and nothing else. She reached question 17 at minute 49 and question 34 at minute 101, flagged five calculations, and finished the first pass with thirty-one minutes left. She scored 81.

After the exam

A pass is the start of the licensing process, not the end. The statewide application described in Lesson 3 needs the score, the insurance certificate from the insurer, proof of experience and any local bonds. If a local license is also needed, its application follows the local process. Tamika filed her statewide application through MOPRO the following Tuesday, with every document attached, and added her renewal date of September 30, 2029, to Joyce's tracker the day the license was issued.

If the result is a fail, the score report is the study plan. Retake rules from Lesson 3 apply: no waiting period, the full fee each time, and a review session only after two failures with a score within 10 points of passing. Most candidates who fail by a small margin pass on the next attempt after two to four weeks of study focused on the weakest areas.

The night before, she did no new studying. She checked her book once more against the bulletin rules, laid out her driver's license and confirmation email, set two alarms and went to bed early. Ron's advice was that the exam tests the skill of finding rules under time pressure, and that skill depends on being rested more than on one more hour of reading.

Ron's last piece of advice was about nerves. If a question looks impossible, flag it and move on; the next three may be easy, and confidence returns with each answer. Most candidates who fail do so because they spent too long on a few hard questions, not because they did not know enough.