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GNFS Aptitude Test: Attention to Detail and Accuracy

GNFS Aptitude Test · Work through your exam, one topic at a time.

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Attention to Detail and Accuracy

What this domain tests

This domain measures accuracy under time pressure: comparing strings, spotting mismatches in records, checking dates, codes, names, totals and form entries. The exam rewards a repeatable checking method, not general vigilance. Most errors come from the brain autocorrecting familiar material, so the method must force character-level comparison.

Core rules

  • Compare in chunks, not whole strings. Split into blocks of three or four characters and compare block by block.
  • Scan left to right and say each character silently; do not let the eye jump ahead.
  • Know the confusable pairs: 0/O, 1/l/I, 5/S, 8/B, 2/Z, rn/m, cl/d.
  • Check transpositions: 18 versus 81, 204 versus 240. Every digit can be present yet in the wrong order.
  • For dates, verify day/month/year order and validity; 31/04 is impossible.
  • For totals, re-add in a different order or subtract back from the stated total.
  • Use a finger or cursor to anchor your place, especially across columns.

Worked example

Record A: “Kojo Mensah | 24/07/1991 | Account 004-218-7”. Record B: “Kojo Mensah | 24/07/1991 | Account 004-281-7”.

The name and date match. The account blocks are 004, 218, 7 versus 004, 281, 7. Block 1 matches; block 2 differs: 218 versus 281, with the 1 and 8 transposed. The error is a transposition, not a missing digit, so a quick “same digits” check would wrongly pass it. The block method catches it because position within the block is checked, not just the set of characters.

Traps that cost marks

  • Reading for meaning instead of characters; familiar names get autocorrected.
  • Checking only the first and last characters of a code.
  • Assuming a repeated field is correct because it matched earlier.
  • Correcting an error mentally and recording a match.
  • Rushing the last item after a run of easy matches.
  • Skipping punctuation and separators, which often carry the mismatch.