My degree isn't Biomed, so I cannot give anything specific. I do Computer Science however. My personal preference is to sit through a lecture and take minimal notes. I've found it more effective to spend the lecture time thinking and pondering about what is being taught, which will then lead to further questions during the Q and A. It's stress free, and I am not worrying about scribbling notes in whatever furiously fast paced fashion is required in order to document everything the lecturer says. Instead, I use the lecture recording afterwards to then take more effective notes. I can identify sections that I've struggled on, and rewind back so that I can listen to them again. I believe this is more effective, because
1) Less stress. You aren't focussed on documenting what the lecturer says.
2) Spaced repetition, because I am reviewing the lecture again a day later to make notes, thus leading to improved retention in memory.
3) I can review the lecture at my own pace. Rewind, skip, fast-forward, whatever.
If your school doesn't record lectures, then I would do it myself with a laptop. Get yourself in the lecture hall early, and sit in the front row.
I did not use an ipad and apple pencil, I used a macbook. I have no strong opinions about whether you should type or write your notes. This is your personal preference. However, if you do type them, you do gain the advantage of being able to more easily sort and find specific sections in your notes because your notes are already in plain text. There's no processing required.
As for my setup, I also have a high-spec PC which is what I consider for general light work and entertainment. My Macbook is my designated work computer, and I have not installed anything for recreation on it. This has helped tremendously for my focus, and is why I would suggest buying a separate device solely dedicated to work. If you could work in a different room as well, that'd be even better. You mentioned you might have ADHD, so maybe you could combine a work laptop + different room with ADHD medication (with approval from your doctor ofcourse), the combination of which could further improve focus.