This document discusses key criteria for developing a valid test, including ensuring test items match instructional objectives and emphasis, including enough items to adequately measure objectives, achieving scorer agreement, having an appropriate difficulty level to differentiate performance, reliability in scoring, fairness for all test takers, providing sufficient time, and an absence of bias.
6.
The test should not be too easy that all
score full marks or too hard that all score
zero. Need a spread of items to give an
appropriate spread of scores