You can do this alone or get a friend to go through the cards with you. Try and get through the deck as quickly as possible.
Solving the perfect squares by using shapes can help you picture the problem visually and further your understanding. If you struggle with working with numbers on a page, you might find this method is more helpful to train your brain.
For example, draw a box that is 3 squares long by 3 squares wide.
Number all the boxes in your 3-by-3 box shape. The highest number will be 9. So, 3²=9.
