There are 45 Action cards in the game, 15 for each level. The level of the action card is denoted by the number of mortarboards on the back. During setup, you will sort these into decks by their level.
As you have to place an Action card under your Study board at the end of every round, it is extremely important to get new Action cards to avoid not having any cards to play later in the game. Remember that Action cards which are not Starting Action
cards always feature a special effect which will give you a greater variety of options.