Looking for leads on citations for independent studies run on the amount of test preparation (practice) on test performance and correlations with academic outcomes (e.g., GPA, job placement?). Much of the research I've found is either dated or generated by test publishers.
e.g.,
Using commercial test preparation materials for improving standardized test scores: Fruitful, fruitless, or fraudulent
WA Mehrens, J Kaminski - Educational Measurement: Issues and Practice, 1988
Thank You! This is very useful. Search terms like "Standardized Tests", "SAT", "TOEFL", etc., have been utterly inundated...
There is a large body of literature concerning specifically test preparation and college admission testing.
E.g. very recently Arendasy et al. (2016):
http://www.sciencedirect.com/science/article/pii/S0160289616300186
Here are several articles that address the relationship between test preparation/coaching and performance. Some are admittedly dated, but do contain information about coaching/preparation duration.
http://dx.doi.org/10.3102/00346543053004571
http://dx.doi.org/10.3102/00028312021002435
http://dx.doi.org/10.3102/00346543060003373
http://dx.doi.org/10.1080/09332480.2001.10542245
http://dx.doi.org/10.1111/j.1468-2397.2011.00812.x
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