<p>My son’s handwriting used to be the same way. He made a concerted effort and improved it within a couple of months. I believe that a drafting class he took in high school helped, but it was mostly the fact that he decided it mattered to him, period.</p>
<p>I have scored standardized exam essays, and I can tell you that, after reading those things for hours, illegible handwriting gets really old. If I could read it, of course I would, but straining to read words one at a time, well, the exam scorers are only human, after all. That’s not to say that anyone would intentionally lower a score for bad handwriting, but I think your concerns are justified, and I do believe that people can change these things if they care about them.</p>