"Or you could use what is called a 'mnemonic device' (pronounced ni-MAH-nik). It's any kind of formula to help you remember. For example, if you want to remember the planets in order from the sun, think: 'My Very Educated Mother Just Served Us Nine Pizzas.' The first letter of each word is the first letter of the planet: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto (if you still count Pluto as a planet).
Make up your own device for the presidents. Start with the first seven: Washington, Adams, Jefferson, Madison, Monroe, Adams and Jackson. How about: 'Will And Jeff Made Many Awful Jokes!'
If none of this works, you can learn 'The American Presidents' song."