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The best thing is to pick an app that fits your type of content - if it's a lot of text, Notion or Anki work great for focused review, but if you need quick video lessons YouTube with organized playlists is unbeatable. Quizlet is also popular for people who like flashcards and want to test their knowledge in an interactive way. At the end of the day, the ideal app is one you actually use without procrastinating, so it's worth testing one or two before the exam so you're not starting from scratch when it counts.
When I need to review something in a hurry, what really works is making handwritten summaries while I read the material - sounds like a waste of time, but it sticks way more than just scrolling through an app. Then I keep those papers and reread them a few days before the exam. But if you want something digital, Quizlet is practical because it gives you those study cards you can review anywhere, and there's also the option to play with the answers, which makes it less tedious.
What nobody usually mentions is using your phone's notes app (or even a simple notepad) to make short questions and answers about the content. Like, you write the question on one side and only check back a few days later to see if you know the answer. It's low-tech, but it works better than a lot of fancy apps because it forces your brain to recall, not just recognize.
If your content has a lot of formulas or calculations, Photomath or Symbolab help you see step-by-step solutions - it's not for cheating, it's to understand where you went wrong. And honestly, combining several things (an app for flashcards, handwritten summary, and maybe a quick YouTube video if you get confused about something) usually works better than betting everything on a single tool.
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