Achievement test is an important tool in school evaluation and has great significance in measuring instructional progress and progress of the students in the subject area.
Achievement means one's learning attainments, accomplishments, proficients, etc. It is directly related to the pupil's growth and development in educational situations.
Tests should give an accurate picture of students's knowledge and skills in the subject area or domain being tested. Accurate achievement data are very important for planning curriculum and instruction and for program evaluation. Test scores that overestimate or underestimate students's actual knowledge and skills cannot serve these important purposes. The investigator conducted a study to construct and standardize the achievement test in biology for 11th class students based on their NCERT books on the basis of the blue print prepared for the achievement test in the light of objectives. After the items were written, the investigator consulted the language and subject expert for checking the items framed with respect to the faulty language and defects in wordings and also to verify whether the items measure what was purports to measured at the level of achievement. For trying out the preliminary draft of the achievement test, the test was given to the sample of 100 students of class 11th. The difficulty value (DV) and discriminatory power (DP) of the test items were determined by adopting Kelley's (1939) method. On the basis of the DV and DP the preliminary draft of the achievement test was modified. In total 100 items having difficulty value (DV) ranging from 0.20 to 0.75 and the items ranging from 0.20 to 0.90 on the discriminatory power (DP) were retained.
Achievement test, difficulty value and discriminatory power
