If Mom simply says, "It doesn't matter if you don't do well on the tests, just try harder next time," the child will feel non-plussed: How can it not matter if you do badly on the tests?
媽媽若只搪塞一句「考不好沒關係，下次再加油」，孩子只會覺得洩氣﹘﹘考不好怎麼會沒關係？