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There is a known practice effect. The statistical g-loading of tests related to general intelligence can be reduced by coaching and practice but not eliminated. Unless you mean actual cheating like intentionally memorizing exact vocabulary or matrix items before testing real intelligence will still factor in.
Precautions for practice effect are often mentioned in administration manuals. Psychologists usually do not give the same test to a subject in a given year for this reason. Due to special Ed evaluations I was the given the WISC-IV and Woodcock Johnson III within 3 months of each other at age 12 and scored 119 on both occasions. The tests were still different enough for there not to be an impact.
This post addresses findings of practice effect for Weschler tests:
https://iqmrdeathpenalty.blogspot.co...fects.html?m=1
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