Diagnostic evidence
If you understand the rules but repeat the same error in the next essay, you need a feedback loop more than another lesson.
Connect practice, scoring, correction, or tool results to the diagnosis and next rewrite of one real essay. The more entry points you compare, the more you need one clear main blocker.
The more writing entries you compare, the more you need one clear main blocker.
If the real problem is that no one identifies the main blocker, more lessons may not change the essay.
Turn course knowledge into one paragraph rewrite and verify whether it changed the essay.
If you understand the rules but repeat the same error in the next essay, you need a feedback loop more than another lesson.
Diagnose one essay first, then decide whether a course is needed.
These pages explain the Banfen Writing diagnostic and blocker-repair method, Task 1 overview, Task 2 development, and common score blockers.
Submit the prompt and essay, find the main blocker first, then decide whether the next version should repair Task 1, Task 2, language control, or paragraph development.