This is the 6363rd most frequent Arabic word.
إكمال
Completion.
The word 'إكمال' (completion) is used here in its noun form to imply 'the act of completing' assignments.
إكمال الواجبات يساعد على تطوير المهارات.
Completing the assignments helps in developing skills.
'إكمال' here also functions as a noun, indicating the finishing of one's studies.
بعد إكمال الدراسة، حصلت على شهادة التخرج.
After completing the studies, I received the graduation certificate.
In this sentence, 'إكمال' again is a noun referring to the act of completing the project.