Look for stable performance across multiple practice sets, fewer repeated concept errors, and the ability to explain why answers are correct—not only total study hours.
Look for several readiness signals
Use blueprint coverage, practice accuracy, stability across multiple sets, error recurrence, time management, and the ability to explain key concepts. No single metric proves readiness.
Separate knowledge from test execution
If knowledge is strong but timed scores are weak, practice pacing and question interpretation. If timing is fine but the same domains fail repeatedly, return to content learning.
Keep a final buffer
Finish core preparation early enough to respond to a weak mock exam. A plan with zero time between the last diagnostic and exam day cannot adapt.