FRNSW Cognitive Test common mistakes
FRNSW Cognitive Test · Understand the traps and how to avoid them.
Under verbal reasoning, reading the passage once and then answering from general knowledge or personal opinion about firefighting rather than from what the text actually states.
The verbal section rewards strict text-bound inference; candidates with strong domain experience often substitute what they believe is true in the real world for what the passage supports, especially on inference and 'which conclusion is best supported' items.
What to do instead
Before answering, underline or mentally note the exact sentence that supports your choice. If you cannot point to a line in the passage, the option is wrong even if it sounds sensible. Practise 20 inference items where the correct answer is counter-intuitive to your prior beliefs.
Treating 'true', 'probably true', 'insufficient information', 'probably false', and 'false' as only two categories, so any statement not directly confirmed gets marked 'false'.
Candidates collapse a five-point scale into true/false. In verbal reasoning tests that use these categories, 'insufficient information' is a distinct and frequently correct answer, and the distinction between probable and certain is what is being measured.
What to do instead
Learn the decision order: is it stated outright (true/false)? Is it strongly implied by the text (probably true/false)? Or does the passage simply not address it (insufficient information)? Drill with passages where the answer is 'insufficient information' at least 30% of the time.
Answering numerical questions by estimating or mental arithmetic and not using the rough-work space, then selecting the nearest-looking option.
Under time pressure, mental arithmetic feels faster, but multi-step percentage or ratio problems invite a slip in one intermediate value. Distractor options are deliberately set to catch common arithmetic errors, so the nearest-looking answer is often a trap.
What to do instead
Write each step as an equation before computing, including units. Check the answer against the options by reversing the operation (e.g. verify a percentage increase by dividing back). Practise 15 multi-step percentage and ratio items per session until the written method is automatic.
Misreading the units or scale in tables and graphs, such as taking a rate per 1,000 as a raw count, or reading a chart axis that starts at a non-zero value.
Fire-service data questions often use rates, per-capita figures, and axes that do not begin at zero. Candidates scan for the biggest bar or number and ignore the label, producing a plausible but wrong comparison.
What to do instead
Before touching the data, read the axis labels, units, and any legend aloud in your head. State what one unit means in plain words. Then answer. When comparing, convert both figures to the same base before deciding.
Assuming a pattern in a sequence of numbers must be arithmetic or geometric, and forcing a fit rather than checking the differences and ratios systematically.
Number-series items in numerical reasoning often use alternating rules, squares, or two interleaved sequences. Candidates see the first two differences and commit to a rule, then find the next term does not exist among the options.
What to do instead
Use a fixed checklist: first differences, second differences, ratios, then interleaved sequences (odd and even positions separately). Only after the checklist fails should you consider squares or primes. Time-box each item to 60 seconds.
Rotating a figure mentally in one step and choosing an option that matches the shape but not the orientation of internal details such as dots, shading, or arrowheads.
Spatial working memory holds the overall outline more reliably than small internal features. The distractor options exploit this by keeping the silhouette correct while flipping one internal element.
What to do instead
Adopt a landmark method: pick one distinctive feature (a shaded corner, an arrow) and track only its position through the rotation. Then verify a second feature. Do not judge by outline alone. Practise with physical cut-out shapes to calibrate your mental rotation.
Confusing reflection with rotation when comparing a figure to its mirror image, and accepting a mirrored option as a valid rotation.
Mirror images preserve shape and many internal relationships, so they look 'almost right'. Under time pressure the difference between a 90-degree rotation and a reflection is easy to miss, especially with asymmetric patterns.
What to do instead
Test chirality: pick three points and check whether their clockwise order is preserved. Rotation preserves clockwise order; reflection reverses it. Apply this check to every option before choosing.
Losing track of the counting rule in cube, net, or block-counting items and counting visible faces only, ignoring hidden cubes or the reverse side of a folded net.
These items require holding a 3D model in mind while applying a rule. Candidates count what is drawn, forget cubes supporting the visible layer, or fold a net in the wrong direction and misplace the pattern.
What to do instead
For cube stacks, count by columns and add the hidden support cubes explicitly. For nets, mark the base face, fold one face at a time on paper, and note which edges meet. Do five net-folding items per practice session and check each against a physical fold.
Answering mechanical items from everyday intuition about how a tool 'feels' rather than applying the lever, gear, or pulley rule, especially on questions about force versus distance trade-offs.
Candidates with trade experience have strong practical instincts but sometimes invert the relationship, for example assuming a longer lever always requires more force, or that a larger gear turns faster than a smaller driven gear.
What to do instead
Memorise the three core relationships: lever moment = force x distance from pivot; gear ratio = teeth on driven / teeth on driver, with speed inversely proportional; a movable pulley halves the effort but doubles the rope pulled. For each item, name the rule before answering.
Ignoring friction, mass, and direction in mechanical reasoning items and choosing the answer that matches an idealised physics result rather than the situation described.
Questions often specify rough surfaces, heavier loads, or opposing forces to test whether the candidate reads the conditions. Candidates default to the frictionless textbook answer, which is offered as a distractor.
What to do instead
Before answering, list the forces named in the question and any stated conditions such as friction or load. If the question mentions resistance, the required effort must be higher, not equal. Eliminate any option that ignores a stated condition.