A learner is ready for their driving test when they can drive safely and confidently in a variety of conditions without your intervention. They should be able to handle different road types, traffic conditions, and basic maneuvers without hesitation. A good indicator is when you feel comfortable and relaxed as a passenger while they're driving. Consider conducting a mock test under conditions similar to the actual driving test. If they perform well, handle unexpected situations calmly, and consistently follow traffic rules, they're likely ready. Remember, it's better to delay the test than to risk failure or, worse, an unsafe driver on the roads.