If a student considers only long study hours as effort but does not check quality, what weakness may remain?

Correct answer: Lack of effective self-assessment

Time spent studying does not automatically show that learning was deep, accurate, or useful. Effective self-assessment also checks understanding, recall, application, errors, and progress toward the target. If the student measures only hours, inefficient methods may continue unnoticed. The other options do not describe the missing evaluation of study quality.