OR Cosmetology common mistakes
OR Cosmetology · Understand the traps and how to avoid them.
Studying only from a state board practice-test app and memorizing answer letters or question stems rather than the underlying rule (e.g., remembering 'the answer is 70% isopropyl' without knowing why that dilution is used for disinfection).
Practice apps repeat a narrow set of phrasings, so candidates score well on the app and then freeze on the exam's reworded items; they never built the concept, only a stimulus-response link.
What to do instead
After each practice question, write one sentence stating the principle behind the correct answer and one example of a different situation where the same principle applies. If you cannot state the principle, mark the topic for textbook review that day. Track topics by concept name, not by question number.
Confusing sanitation, disinfection, and sterilization, and applying the wrong level of control to an implement (e.g., claiming a hospital-grade disinfectant 'sterilizes' nippers, or using a UV cabinet as the sole step for a blood-exposed tool).
The three terms sound interchangeable in everyday speech, and candidates memorize definitions without mapping each to a concrete object and contact scenario (nonporous surface, porous item, skin, blood exposure).
What to do instead
Build a three-column table: term, what it kills, example object, required product or process. Drill the edge cases explicitly: items that contact blood or broken skin, porous vs. nonporous, and what to do when a client is cut. Verify the disinfectant's label contact time rather than assuming one minute.
Treating infection control as a list of products to name rather than a sequence of behaviours, so answers about handwashing order, glove changes, or tool flow through the station are guessed.
Candidates study product labels because they are concrete, but exam items often test procedure order and cross-contamination logic, which requires imagining the actual service flow.
What to do instead
Walk through a full service verbally, narrating every handwash, glove change, and tool transfer from dirty to clean. Practice explaining why each step exists. Any step you cannot justify is a gap to review.
Mixing up the layers and cell biology of hair, skin, and nails (e.g., saying the medulla is the outermost hair layer, or that the stratum corneum is living tissue), and then missing every item that builds on that anatomy.
Anatomy is memorized as isolated vocabulary lists late in study, so the terms never get organized into a structural hierarchy, and similar-sounding names blur under exam pressure.
What to do instead
Draw each structure from memory (hair cross-section, skin layers, nail unit) and label it, then check against the text. Attach one function to each part, since exam items usually ask about function, not just the name. Redraw weekly until the diagram is accurate without notes.
Applying chemical and physical principles by rote without tracking what the product actually does to the hair (e.g., assuming a higher-volume developer always lightens more, or that all perms process the same way regardless of wrap and lotion strength).
Candidates memorize numbers (volumes, pH values, processing times) as facts to recall, but the exam asks them to predict an outcome, which requires connecting the number to the chemical action.
What to do instead
For each chemical service, write the cause-and-effect chain: product pH, what bonds it breaks or reforms, what that means for curl or color, and what client history (previous lightening, relaxer, heat damage) changes the result. Test yourself by predicting outcomes for hypothetical clients rather than reciting numbers.
Answering client-safety and contraindication items with the 'usual' service instead of screening first, such as proceeding with a color service over a client's undiagnosed scalp lesion or ignoring a prior reaction to hair dye.
Candidates focus on technique and service steps, and screening questions feel like paperwork, so they underestimate how often the exam tests when to refuse, patch test, or refer out.
What to do instead
Memorize a short screening checklist (skin or scalp condition, known allergies and prior reactions, medications, pregnancy, recent chemical services, open wounds) and practice applying it to scenario items before choosing a technique answer. When an item mentions a symptom, treat that as the decision point.
Skipping or misapplying patch tests and preliminary strand tests, including choosing the wrong location, timing, or interpretation of a positive result.
These are short procedures that seem minor next to the service itself, and candidates conflate the patch test (allergy screening on skin) with the strand test (predicting color or processing result on hair).
What to do instead
Learn the two tests as separate cards: purpose, where performed, how long before the service, and what counts as a positive or adverse result and the required action. Practice stating both aloud in under 30 seconds each.
Misreading scenario questions that hinge on one qualifier - 'first', 'best', 'except', 'not' - and selecting a true statement that does not answer the question asked.
Under time pressure, candidates pattern-match to a familiar phrase and stop reading, and many distractors are deliberately true statements that are simply not the priority action.
What to do instead
Cover the answer options, read the stem twice, and state in your own words what is being asked before looking. Circle or underline qualifiers. When two options both seem correct, ask which one is the immediate or highest-priority action, which is usually the safety step.
Spending uniform time on every item and running out of time, leaving later questions blank or rushed even though the exam does not penalize a best-guess answer.
Candidates either over-invest in hard calculation or terminology items or panic early, and they have not rehearsed pacing under timed conditions.
What to do instead
Take at least two full-length timed practice runs. Adopt a rule: answer every item, flag long ones, and return only after completing the section. Know your average seconds per item and check the clock at planned intervals rather than continuously.
Neglecting the business, licensing, and professional-practice content (scope of practice, sanitation regulations, client records, communication and ethics) because it feels less like 'doing hair'.
Candidates prioritize technical services, but these items are typically straightforward points that are easy to secure with modest study, so skipping them costs easy marks.
What to do instead
Allocate dedicated review blocks to regulations and professional practice, and learn your jurisdiction's rules on scope of practice, sanitation requirements, and record keeping from the official licensing source. Practice short scenario items on client confidentiality, consent, and referral.