As above, just learn them I'm afraid. Use que cards if you have to and get someone to test you. You'll find that the symbols aren't just completely random, they are inherently designed to look somewhat like what they are depicting (to a point) and many are just variants (light, moderate, severe, of the same thing).
You will need to use the, in the future so you may as well learn them at this early stage so the are ingrained to use in the future.