NCCCO Core study guide: study time by domain weight and the CCO reference list

The numbers the plan is built on

✓ The current candidate handbook (printed page 2) lists the Core exam as 95 questions in 90 minutes, calculator not permitted, with four domains weighted at approximately 22%, 28%, 23% and 27%.

The handbook's own outline is the thing to study from, and it has changed. ✓ The January 2024 handbook (printed page 2) listed 90 questions and weights of approximately 20%, 26%, 28% and 26%, and its tasks are numbered differently. If a study guide, school handout or app quotes 90 questions or weights Technical Knowledge heaviest, it was probably built on that earlier revision. Section numbers on this page follow the 01/25 handbook. Check the revision code at the bottom of the cover of whichever handbook you are reading.

The question column is our arithmetic (95 × weight, rounded), not a published count. The handbook says "approximately", so treat each figure as a range of one or two questions either way.

The task column shows something the percentages hide. Load Charts has only five listed tasks but carries more than a quarter of the exam, so each Load Charts task stands for roughly 5% of the test. Operations spreads 28% over 22 tasks, about 1.3% each. Missing one load chart skill costs far more than missing one operations topic.

Study time by domain weight

NCCCO does not publish a recommended amount of study time, and we don't set one either. Whatever total you have, split it in the same proportions as the 01/25 weights:

The share column is the published weight. The per-task column is our arithmetic (weight ÷ tasks), so treat it as a guide to where one extra session pays off most, not as a published figure.

Then adjust the split before you start, not halfway through:

• Shift time toward your weakest domain. Take the free 10-question check, note your lowest domain score, drill the terms with the free NCCCO written flashcards, and move up to a quarter of your strongest domain's share into it. A quarter of Operations' 28% is 7 points, which would take Site from 22% to 29%. Ten questions is a rough signal, so confirm the weak area with a longer practice set before moving more.
• Protect the Load Charts share. Because each of its five tasks is worth so much, do not cut it below 27% even if you feel confident.
• Set aside hand arithmetic inside Load Charts. Core task 4.2 is about reading, writing and using arithmetic, and the Core exam has no calculator. Give about a fifth of your Load Charts share (roughly 5% of all your study time) to timed pencil-and-paper practice with subtraction, multiplication and percentages.
• Keep a time check. 90 minutes for 95 questions is just under a minute per question. In the last week, do at least one full-length timed session.

The references CCO lists, with editions

✓ The handbook's Reference List (printed page 17) says CCO's Written Examination Management Committee uses the most recent versions of these materials to verify the accuracy of test questions:

Three details are worth knowing before you buy anything:

• The years are a floor, not a lock. The same page says the most recent versions are used. If a publisher has issued a newer edition than the one listed, the handbook wording points to the newer one. Check the publisher's site for the current edition before buying.
• The OSHA rules are free. ✓ Subpart CC (sections 1926.1400 to 1926.1443) and 1910.180 are published on osha.gov. On that page, 1910.180 is titled "Crawler locomotive and truck cranes", not the handbook's label, so search for the section number rather than the title.
• The outline names one standard the list leaves out. Core task 3.1 names ASME B30.5, B30.10, OSHA 1910.180 and OSHA 1926 Subpart CC. B30.10 does not appear on the Reference List. If you have access to it, read it alongside the hook block and overhaul ball task (3.7).

Which reference covers which outline task

This map is our own reading, matched by section title. CCO does not publish a task-by-reference map, and a question can draw on more than one source. OSHA section numbers and titles were checked on osha.gov on 20 Oct 2026. For the ASME standards and the three manuals, use each book's own index and table of contents; we do not cite their internal numbering here. Task numbers read as domain then item, so 2.12 is Domain 2, item 12.

Domain 1: Site

Domain 2: Operations

For 1.3, 2.5 and 2.15, the crane power line clearance calculator shows the OSHA minimum distance for a voltage, in work and in travel, so you can see how the bands change. It states the rules, it does not replace them.

For 2.9 (lifting from beneath water) and 2.10 (tag lines), search the IHSA, AEM and IPT indexes.

For 1.1 and 1.2, the outrigger pad calculator turns an outrigger load and an allowable ground pressure into the pad size that keeps the pressure down.

For 2.7, the crane hand signals drill shows the 19 signals from OSHA's Subpart CC Appendix A in original drawings and scores you on naming each one.

Domain 3: Technical Knowledge

For 3.10 (instruments and gauges) and 3.13 (personnel safety during inspections), start with the manufacturer's operator manual and OSHA 1926.1412.

Domain 4: Load Charts

The references explain the rules; the skill comes from working charts. Our load chart practice uses invented charts, not manufacturer or exam charts, so you can repeat the radius, gross capacity and deduction steps until they are routine. When a problem gives boom length and angle instead of radius, work the radius out with the crane radius and boom angle calculator.

Ready to test yourself? The free NCCCO practice test gives you three explained sample questions across Site, Operations and Load Charts.

NCCCO exam prep: a four-week order of work

If you are budgeting the whole route, the crane operator certification cost guide covers what certification costs end to end. This is one way to sequence the shares above. Shorten or stretch it to fit your date, and remember that passing your first exam starts the handbook's 12-month window (see fees, retakes and the 12-month window).

Splitting Operations across two weeks by task count is our assumption, not a CCO rule. Load Charts is placed last in this order so you finish on it, but do a short block of chart arithmetic in each earlier week as well, taken out of the Load Charts share. Keep a log of every missed practice question with the outline task number beside it. By week 4 the log shows which task numbers to reread, and which reference to open for each. Prefer paper? Print the free study checklist (PDF) and tick off topics as you cover them. The flashcards print as cut-out cards too (free PDF).

Test yourself every week

Take the free 10-question check at the end of each week and see which Core domain still costs you points. The course adds full timed exams that match the Core format, explained answers on every question, and a plan built from your weakest domain.

FAQ

How many questions are on the NCCCO Core written exam?

The current candidate handbook (cover revision 01/25) lists 95 questions in 90 minutes, with no calculator. The January 2024 revision listed 90 questions, so check the revision code on the cover of the handbook you study from.

How should I split my Core study time?

Split it in the same proportions as the 01/25 domain weights: about 22% Site, 28% Operations, 23% Technical Knowledge and 27% Load Charts. Then move up to a quarter of your strongest domain's share into your weakest, and keep Load Charts at 27% or more.

Which references does CCO list for the Core exam?

The handbook's Reference List names ASME B30.5 and B30.30, the IHSA and AEM mobile crane manuals, OSHA 1926 Subpart CC, OSHA 1910.180 and IPT's Crane and Rigging Handbook. It says the most recent versions are used, and the OSHA rules are free on osha.gov.

Is there a free NCCCO study guide PDF?

Yes. Print our free study checklist (PDF) to tick off what to be able to do under each Core domain, and our free NCCCO written flashcards (PDF) as cut-out cards. Neither needs an email. Then take the free 10-question check to see which domain to study first.

What is the best way to prep for the NCCCO written exam?

Split your time by the four domain weights, open the CCO reference listed for each outline task, and take the free 10-question check once a week to see which domain still costs you points. The four-week order above puts those steps in sequence. If you are weighing a paid option, see what an NCCCO exam prep course should include.

How long should I study for the Core exam?

NCCCO does not publish a recommended study time, and we don't set one. The four-week order on this page is one way to sequence your study, so stretch or shorten it to fit your test date.

Sources

Show the list

• Mobile Crane Operator Candidate Handbook, CCO, cover MCO CH REV 01/25, inner pages REV 06/24. Core outline on printed pages 2 to 3; Reference List on printed page 17. Retrieved 20 Oct 2026.
• Mobile Crane Operator Candidate Handbook, January 2024 revision, CCO, MCO CH REV 01/24, printed page 2. Retrieved 20 Oct 2026.
• 29 CFR 1926 Subpart CC: Cranes and Derricks in Construction, OSHA, section numbers and titles. Retrieved 20 Oct 2026.
• 29 CFR 1910.180: Crawler locomotive and truck cranes, OSHA, paragraph headings. Retrieved 20 Oct 2026.