LucidChart is a website and app that allows you to make free mindmaps to support your revision.  It’s available from both the App Store and Google Play.

Quizlet allows you to create your own set of flashcards in an app.  It’s free and really easy to use — just add a term and definition. You can even add an image from Quizlet’s library. Once your flashcard set is complete, you can study and share it with friends.

Habitica  Forming good routines and habits is hard but essential for academic success, so why not make it a bit easier and make it fun too!
Input your Habits, your Daily goals, and your To-Do list, and then create a custom avatar. Check off tasks to level up your avatar and unlock features such as armor, pets, skills, and even quests! Fight monsters with friends to keep each other accountable, and use your gold on in-game rewards, like equipment, or custom awards, like watching an episode of your favorite TV show. Flexible, social, and fun, Habitica is the perfect way to motivate yourself to accomplish anything.