How Hard Is the NM-GB98 Exam? Complete Difficulty Guide 2026

Overview: How Difficult Is the GB-98 Combination Exam?

The New Mexico GB-98 General Building Contractor Exam isn't difficult because the content is obscure - it's difficult because of volume, breadth, and the way New Mexico structures the combination technical test. Candidates sit for two exams back-to-back-in-spirit: GB-2 Residential Building Contractor Part 1 (80 questions, 225 minutes) and GB-98 General Building Contractor Part 2 (100 questions, 310 minutes). That's 180 total questions spanning sitework, concrete, masonry, carpentry, roofing, metals, associated trades, code, plan reading, estimating, and OSHA safety - administered through PSI under the Construction Industries Division's April 3, 2026 bulletin.

Each part is scored independently, and each requires 75% to pass. There is no averaging between parts. If you clear Part 1 comfortably but fall short on Part 2, you retest only the part you missed - but you pay for that privilege. For a full breakdown of exactly what "passing" means numerically, see our NM-GB98 Passing Score guide.

Why the Two-Part Structure Raises the Stakes

Many candidates underestimate the combination format. Part 1 (GB-2) is shorter but still demands 80 correct-leaning answers across eight domains in 225 minutes - roughly 2.8 minutes per question when you factor in reference lookups. Part 2 (GB-98) is longer: 100 questions in 310 minutes across nine domains, including the largest single domain on the entire exam.

Because the two parts test overlapping subject areas (sitework, concrete, masonry, carpentry, roofing, associated trades, and general code/plan reading/estimating all appear in both parts, just with different question counts and emphasis), candidates sometimes assume mastering Part 1 automatically prepares them for Part 2. It doesn't. Part 2's General Code, Plan Reading, and Estimating domain alone carries 27 questions - nearly triple the 14 questions Part 1 devotes to the same topic area. That shift in weighting is the single biggest reason candidates who "passed easily" in Part 1 get surprised in Part 2.

For a domain-by-domain breakdown of how the content is organized across both parts, our NM-GB98 Exam Domains Guide maps all 17 areas in detail.

Which Domains Are Hardest, Question by Question

Not all 17 domains carry equal weight, and difficulty tends to track question count - more questions means more surface area for tricky code references, calculation-heavy items, and plan-reading scenarios.

Other domains worth respecting: Part 1 Carpentry and Associated Trades (12 questions each), Part 1 Roofing (10 questions), and Part 2 Masonry, Metals, and Associated Trades (10 questions each). Smaller domains like Part 2 Roofing (6 questions), Part 2 Carpentry (6 questions), and OSHA Safety in either part (8 and 6 questions) are lower-volume but still require solid fundamentals - a single careless mistake in a 6-question domain costs proportionally more than one in a 27-question domain.

Open Book Doesn't Mean Easy

Both technical parts are open book, and that fact frequently misleads candidates into under-preparing. Open book only helps if you know where to look. References must be bound and may be highlighted, underlined, indexed, and permanently tabbed before test day - but they cannot contain loose papers or handwritten notes. A silent, nonprinting, nonprogrammable calculator is permitted.

In practice, this means the real skill being tested isn't memorization - it's speed of retrieval. With 310 minutes for 100 questions in Part 2, you have roughly 3.1 minutes per question, and every second spent flipping through an untabbed code book is a second you don't have. Candidates who walk in with a generically tabbed reference (rather than one indexed against the specific domains above) routinely run out of time before running out of knowledge.

The Business and Law Requirement Adds Another Hurdle

New contractor candidates must also satisfy a separate Business and Law requirement, either by passing the PSI Business and Law examination or completing an approved course. The PSI Business and Law exam has 50 questions, runs 130 minutes, is open book, and also requires a 75% passing score. It costs $68.88.

This means a first-time GB-98 candidate is realistically preparing for three distinct scored assessments (Part 1, Part 2, and Business and Law) - not one. Each has its own question style, its own reference set, and its own 75% bar. Treating them as a single "exam" is a common planning mistake that leads to under-preparation for whichever piece gets studied last.

Eligibility Friction Before You Even Sit Down

Difficulty doesn't start at the testing center - it starts with eligibility. New Mexico requires four years and 8,000 hours of qualifying experience within the preceding 10 years before you can sit for the GB-98 combination exam. Approved education or training can offset up to half of that requirement through half-time credit, but the documentation burden (affidavits, verified work history) is itself a barrier that trips up candidates who assume they qualify.

The qualifying-party application and work-affidavit fee is $36, separate from exam fees. Once approved, your examination eligibility window lasts six months - so procrastinating after approval carries real risk of having to reapply. For a full walkthrough of what counts as qualifying experience and how half-time credit works, see NM-GB98 Requirements 2026.

The Cost of a Failed Attempt

Part of what makes this exam feel hard is that failure isn't free. The full GB-98 combination technical exam costs $269.06, but a one-part retake costs $134.53. If you fail Part 2 - the larger, more heavily weighted part - you're paying nearly half the original combination fee to try again, on top of scheduling delays through PSI.

This financial reality is why domain-level preparation matters more here than in exams with flat retake fees or unlimited free reattempts. Every wasted study hour on a low-question-count domain, at the expense of a 27-question domain, has a real dollar cost if it tips you below 75%. Our NM-GB98 Certification Cost breakdown lays out every fee - application, exam, and retake - so you can budget for a second attempt if needed without it derailing your plans.

A Realistic Study Timeline for the Combination Exam

Given the domain weighting, a sequential study plan that front-loads the highest-question domains tends to outperform a plan that studies topics in whatever order a textbook happens to present them.

For a more detailed week-by-week methodology, including how to pace review sessions against the exact minute limits above, see the NM-GB98 Study Guide 2026.

Who Tends to Struggle, and Why

The GB-98 credential is pursued by residential and commercial builders, remodeling contractors, and tradespeople expanding into general contracting roles across New Mexico. Difficulty tends to concentrate in three groups:

• Specialists moving into general work: A candidate with deep carpentry or masonry experience but limited exposure to estimating or plan reading often underperforms on Domain 16's 27 questions, since field experience doesn't always translate to code-book navigation speed.
• Candidates who skip reference preparation: Anyone who shows up with an unindexed, untabbed code book loses time on every single question, compounding across 100-question Part 2 sessions.
• Candidates who ignore Business and Law until the last minute: Treating the 50-question Business and Law exam as an afterthought often means walking in underprepared for a section with the same 75% bar as the technical parts.

If you're weighing whether this credential fits your career goals before committing to the study investment, our ROI analysis of the NM-GB98 certification and NM-GB98 Salary Guide are useful starting points. You can also review current opportunities in NM-GB98 Jobs to see how the license is used in the field.

To build hands-on familiarity with the question style described throughout this guide, practicing under realistic timed conditions on our practice test platform is one of the most direct ways to find out which domains need more work before you spend money on an actual attempt.

Frequently Asked Questions