Quite frankly, You sound like you’re in really solid shape as a sophomore. A 30 is better than I had sophomore year, and I think with your prep course you can easily get that up at a 33-34. The internship sounds incredible, and will be a fantastic opportunity to write about. Your grades are great, and if you continue to excel you’ll be really solid for Notre Dame.
wneely16 has some great tips, so my only contribution would be to keep up the great work, visit if you can at some point, and consider applying to summer scholars for next summer. Also, what really helped me studying for the ACT was buying Barron’s or Princeton Review ACT prep books, and taking their practice tests. The volume of problems did wonders helping me do better, and between those two and some apps I bought off the apple app store I probably did about 1000 MC problems between my first and second test. It did wonders for my score, and I think it could help you too. If you have time outside of your internship this summer or next year, shoot to do one full test a week. break it up over a few days and it can be really beneficial. Also, the library has reference versions you can borrow (can’t write in, but it’s easy enough to do on a piece of lined paper)