Learn the prefixes, suffixes and root words that make up medical terms. By breaking down the word into its various components and knowing how to spell each one correctly, you increase your odds of being able to spell the longer words as well. Refer often to your textbooks to ensure you are learning each word correctly.
Use Internet resources, games and study tools. Repetition reinforces knowledge and using tools like those available at Quizlet, Sheppard Software and Fun Trivia will help you memorize the spelling of medical words.
Use medical terminology flashcards. Available in college bookstores, online and general bookstores, use medical terminology flashcards like any other flashcards to reinforce learning and memorization. Split your flashcards into smaller groups and review the prefixes, suffixes and root words in each group repeatedly, until you know how to spell each one. Learn the meanings on the back of each card to make a connection between the spelling of the word part and its meaning.
Make several copies of any worksheets you receive in class and work through them repeatedly until you master the spelling of every word. Spending time outside of class in independent study will reinforce what you learn in class.