IPA: //ˈpoʊstˌtɛst//
KK: /ˈpoʊstˌtɛst/
A test that is given to students after they have completed a lesson or course to see what they have learned.
The teacher administered a posttest to evaluate the students' understanding of the material.
Posttest → It is formed from "post-" (meaning after) and "test" (from Latin "testari", meaning to witness or to prove). The word "posttest" refers to a test administered after a particular event or instruction to assess knowledge or skills gained.
Think of taking a test "after" something has happened — "post-" means after, and "test" relates to proving knowledge.