If you are new to ANKI, essentially it is a free desktop app that uses spaced repetition in order to help you study effectively. You can read more about the app here ANKI
On AnkiWeb you can gain access to pre-made ANKI decks created by other users. These decks can be downloaded and appended to your desktop app. The most highly rated MCAT ANKI deck is the Milesdown Deck which contains over 2800 flashcards.
Use this link to check out other decks: https://ankiweb.net/shared/decks/mcat