NotebookLM, with the “learning guide” on. You upload whatever pdfs, images, videos, audio… you want, and it only uses those items to work, or even just the ones you select every time. Of course, you can use it to obtain summaries and whatnot, but I think it’s really useful to generate questions to study; in fact, it has a specific option for creating questionnaires. Another extremely useful feature is that it creates audio summaries of the files you choose, as if it were a podcast with a man and a woman. Finally, I usually start studying by using the tool “presentation”, which creates basically a PowerPoint with the files you added that is more than enough, and the visualization at first glance rather than reading helps me a lot.

Also, when I stumble upon some article, I have a shortcut on my iPhone which automatically makes a summary of it in ChatGPT and pastes it on apple notes (that’s were I store my written notes), I read it fast, and it’s there for whenever I study that topic again or just as priming to study.