The spelling and pronunciation are different, as are the meanings, of these two words but they are all similar enough to be misused without most people realising.

aural: [adjective] related to the ear or the sense of hearing
An aural learner may study better by reading notes out loud or discussing the concepts.

oral: [adjective] the mouth or related to the mouth
His oral presentation was fanatic but his written report was poor. Babies putting everything into their mouth is known as the oral stage of development.

You may be able to remember which is which by thinking of the O you make with your mouth being oral.