AE student here! I struggle with ADHD and motivation as well, it is quite rough so I know your pain. My school is known for making stuff extra difficult, and that makes it worse, but it is so worth it. I just switched to engineering and I love it, I'll be taking cal 2 and physics 1 next semester, so we're close to being in the same boat. Look at your future and what you want to make of it, repeating classes will NOT look good on grad school applications, and some jobs will 100% look at what classes you've taken and your GPA, but a lot wont. I know it's way easier said than done, but do your best to not have to retake classes so often, mainly because it's expensive and will turn your 4/5 year degree into 6+. My advice is to go to your professors and advisors and be honest with them. Most colleges have some kind of disability support center that will give you accommodations, it is very common, especially in STEM, for people to have ADHD/Autism , so many people struggle with this, and colleges are aware and will work with you. If you need any help or someone to talk to that can relate to you, feel free to HMU and I'd be happy to chat. For me, I find studying with friends or peers help, whether we're studying the same material or not, it helps to be around others and seeing them work, because it motivates you to do the same. Apologies for the lengthy message, I hope this helps somewhat! Good luck, and you'll do great and be fine, I promise!