Best AI tools for students & competitive exam prep? Did I miss something?

Hey everyone, I haven’t been keeping up much with AI news lately, so I might have missed some useful tools. I wanted to ask: Are there any AI tools that genuinely help students learn better? Which AI tools do you personally use for studying or revision? Any tools specifically helpful for competitive exam preparation? I’m mainly looking for tools that can help with: Better understanding of concepts Active recall / spaced repetition Notes making or summarization Practice questions / mock tests Free tools would be even better, but feel free to suggest paid ones if they are really worth it.