NGWA CWD common mistakes
NGWA CWD · Understand the traps and how to avoid them.
Treating the general drilling section as a single undifferentiated body of knowledge and studying pump installation, grouting, and well development with equal shallow attention instead of mapping each topic to its own sub-area and checking coverage topic by topic.
The general drilling domain is broad, so candidates skim a textbook or course once, feel familiar with everything, and mistake recognition for recall; on exam day they cannot produce the specific numbers, sequences, or definitions for any one sub-topic.
What to do instead
Build a one-page checklist of general drilling sub-topics (drilling methods and their formation suitability, bits and tooling, casing and screen selection, grouting and sealing, well development, disinfection, pump and system basics, site safety) and mark each as unknown, shaky, or solid; study only the unknown and shaky rows and re-test yourself aloud until every row is solid before moving on.
Memorizing drilling-method names without being able to match a method to a formation, depth, and purpose (for example choosing among auger, rotary air, rotary mud, and cable tool for a given lithology and well use).
Method names are easy to learn as vocabulary, and candidates stop at definitions because the exam-style scenario phrasing is unfamiliar; the linkage between formation, hole stability, sample quality, and method is never rehearsed.
What to do instead
For each major method, write a short card listing formations it suits, formations it fails in, typical depth range, how cuttings or samples are returned, and one reason to reject it; then practice by reading a formation description and justifying a method choice in three sentences.
Confusing grouting and sealing requirements: applying the same neat-cement mix, annular space, or placement method to every casing string, and mixing up the purposes of sanitary seal, annular seal, and abandonment plug.
Grout topics read similarly across contexts, so candidates collapse them into one mental model and then answer scenario questions with the wrong material, wrong interval, or wrong placement technique.
What to do instead
Create a comparison table with columns for purpose, typical material, placement method, and interval covered, and fill one row each for the sanitary seal, the upper annular seal, deeper sealing where required, and well abandonment; recite the differences until you can state which requirement changes when the well use or formation changes.
Skipping the numerical content of the general domain, such as unit conversions, annular volume and grout quantity estimates, and dilution or dosage calculations, and planning to guess on those items.
Candidates with field experience rely on habit and rules of thumb rather than written formulas, so they avoid calculation practice and freeze when a question presents numbers in unfamiliar units.
What to do instead
Write the handful of formulas you actually need (cylinder volume, annular volume, grout yield, dilution) on one card, then solve five word problems per formula using the units the exam uses, showing every step, until the setup is automatic.
Treating the specialized drilling domain as an extension of the general domain and studying it with the same generic materials, without obtaining or working through content specific to the chosen specialty.
The candidate selects a specialty they already work in, assumes experience equals exam readiness, and never checks the specialty's own scope, terminology, and regulatory expectations against a study outline.
What to do instead
Obtain the published content outline for the chosen specialty, list its distinct topics, and for each one write what you do on the job and what the exam likely expects; fill gaps with focused reading, and spend at least a third of total study time on the specialty alone.
Answering specialty scenario questions from habit and local practice rather than from the standards and accepted practice the exam reflects, especially on safety procedures, equipment limits, and reporting obligations.
Experienced drillers have efficient local shortcuts that may deviate from written standards, and they answer with what their crew does instead of what the referenced practice requires.
What to do instead
For each specialty procedure you perform regularly, write the written-standard version next to your local version and note the difference; when they conflict, learn the standard version as the exam answer and keep the local version as an operational note.
Ignoring the licensing and regulatory layer of the specialty, such as notification, permitting, well construction reporting, and abandonment documentation, because it feels like paperwork rather than drilling.
These topics are administrative, rarely practiced during a shift, and easy to postpone; candidates then lose straightforward points on questions about who must be notified, what must be recorded, and when a report is due.
What to do instead
Make a one-page timeline for a typical well from pre-drilling notification through completion report and abandonment record, listing the action, the responsible party, and the timing at each step; test yourself by covering the action column and reciting it.
Studying only from memory of the job and never doing timed practice under exam conditions, so pacing, question-reading, and answer-changing behavior are untested.
Candidates believe familiarity with the work substitutes for test practice, and they discover on exam day that scenario questions take longer to parse than expected, leaving later items rushed.
What to do instead
Take at least two full-length timed practice sets, one early and one a week before the exam; after each, log every item where you changed a correct answer or ran short on time, and practice a fixed rule for when to flag and return rather than second-guess.
Reading only the first plausible answer option and selecting it without eliminating the others, particularly on questions with qualifiers such as most likely, first step, or except.
Under time pressure the brain latches onto a familiar term in one option, and candidates skip the discrimination step that the question is actually testing.
What to do instead
Adopt a fixed routine: read the stem to the end, state what is being asked in your own words, predict the answer before looking, then eliminate each option with a written reason; only then choose, and re-read the stem for qualifiers before confirming.
Leaving weak sub-topics unresolved and hoping they will not appear, instead of tracking error patterns across practice sets and closing the specific gaps they reveal.
Candidates review practice tests by total score rather than by topic, so the same few sub-areas keep generating misses without ever being identified as the cause.
What to do instead
Keep an error log with columns for topic, domain, what the question tested, why you missed it, and the corrected fact; tag each miss to a domain and sub-topic, then schedule a short review of the top three recurring tags every few days until they stop appearing.