Over time everyone forgets what they have learnt. The trick to remember is to move information from short-term memory to long-term memory. This can be done via a process called Active Learning, which is, attempting to remember without any prompts (like multiple choice etc). Flashcards are known to be a proven effective method to achieve this. The FlashBack app further makes this efficient by understanding your recall abilities and prompting you when a particular deck of cards you have likely forgotten.