<p>a. is no problem, you don’t need to do anything. The major you listed on your application is only a prospective major and doesn’t have an official status when you attend. It’s sophomore year when you formally declare a major. </p>
<p>b. not sure about, but I’m pretty sure it would carry over from A&S to engineering. You should contact OAFA as soon as possible if you really want to make the switch, as I remember there are additional merit scholarships for engineering that can be stacked on top of full tuition. </p>
<p>Congrats!</p>