Self-study is enough when the learner can diagnose mistakes, understand the correction, practise accurately, and show improvement without repeated external rescue. Independence does not mean never asking a question. It means the student can use feedback, return to the work, and carry the learning forward with increasing control.
The best evidence is transfer. After self-study, can the student solve a different question, explain the idea clearly, remember it later, and avoid the same error under pressure? If yes, the system is working. If progress depends on constant prompting or the same weakness repeatedly returns, the learner may need a stronger explanation, better feedback, or direct teaching for a period.
Use the Study & Learning Methods Hub to strengthen independent learning, and the Diagnostics & Recovery Hub when self-study is not resolving the bottleneck.