You’d need the right angle. And the idea is, “Show, not just tell.” A nice narrative that reveals the attributes they want.
But if this is for a highly competitive, they like more than a version of, “And my grades turned around.” Whatever growth it was/is, is it reflected in other positives? Are there examples that show he then took on more stretch, maybe taking a chance in new directions (ECs,) taking on other responsibilities, or doing for others, etc?
It’s all in how he can craft it, not to just be a dry tale that ends, “And now I’m motivated.” Show it. More than grades.