What's the best way to use physical cards for note-taking in a noisy classroom?

I totally get why you'd struggle to stay focused in a noisy classroom, and I'm glad you've found physical cards to be helpful so far. I think it's great that you're writing down key terms and concepts on index cards - that's a fantastic way to start. As for organizing your notes, I don't think you need to stick to a specific system like the Cornell method if it doesn't feel natural to you. I'd suggest experimenting with different ways of categorizing and grouping your cards to see what works best for you.

One thing that might help is to use different colors or symbols to differentiate between main ideas and supporting details. For example, you could use a green pen for key terms and a blue pen for examples or explanations. That way, you can quickly scan through your cards and see the relationships between different concepts. You could also try grouping your cards into categories or topics, and then reviewing them regularly to make sure you're capturing all the important information.

I think the key is to find a system that's flexible and easy to use, so you don't get overwhelmed by too many cards. You might consider setting a limit on the number of cards you use per lecture, or designating specific cards for specific types of information. The most important thing is to make sure you're reviewing and reflecting on your notes regularly, so you can identify areas where you need more practice or review.

Overall, I think you're on the right track with using physical cards, and with a bit of experimentation, you'll find a system that works well for you. Just remember to be patient and flexible, and don't be afraid to try new things or adjust your approach as needed. Good luck, and I hope you find a system that helps you stay focused and succeed in your classes!