Zimmerman (1989) defined 'self-regulated learning' as an active learner who participates learning metacognitively and synchronously in a behavioral way.
The self-regulated learners voluntarily perform self-evaluation  /  organization · modification   /  goal setting and planning  /  information retrieval   /  record keeping, monitoring, environmental structuralizing  /  test-taking   /  review materials in the learning phase.

able students can improve their metacognitive abilities by using Zimmermann's theory.
Students manage and control the cognitive ability and cognition to perceive the learning material given to them, manipulate it, store it in long-term memory, and retrieve it when needed.
able applies ‘self-check and self-record’ to the learning system so that learners can self-regulate to improve their grades.