WHOLE CHARACTER
成
to finish; to succeed (成功, 完成); to become (变成, 长成); one tenth (三成); (OK) all right (成,就这么办); established (成语, 成规)
成 is to become — finishing what you start, and succeeding.
Taught as one complete written unit; the header marks 会意, and the modern strokes fuse, so no split is forced.