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Once you've figured out what words challenge you, you need to make a plan for how you will move through your list in a limited amount of time. You need to make a plan so that you can cover all of your words quickly at least 3 times. Preferably, you want to cover tougher words 4 or 5 times (or until you're comfortable with those words). Consider a few things:  Your limited amount of time. Days you might be too busy to study. Periodic tests and quizzes. Extra time for extra challenging words. Find yourself a good dictionary and some websites that will help you study. Your dictionary is going to be your most important study resource, so it should be one that you are comfortable using. In addition, websites will make studying a bit more fun, and perhaps easier.  Dictionaries can be bought at pretty much any book store, but make sure to get one that is recommended and/or approved by your spelling bee organization. A good dictionary will show a word's root, phonetic spelling, common usage, and even origin. Oxford is a good choice, but Merriam-Webster's is the official choice of the Scripps National Spelling Bee, and many smaller spelling bee organizations also recommend it. Vocabulary.com has a very helpful word list building tool. See it at https://www.vocabulary.com/lists/vocabgrabber  Take a look at Merriam-Webster's Word Central at http://www.wordcentral.com/. If you are a younger spelling bee competitor, you can play games and build your own dictionary of tough words! Make sure to get a notebook in order to store your word lists and the paper that you'll be writing on when studying. A good organized notebook with your main word list, lists of challenging words, notes, definitions, and more, will be critical to your success.
Make a plan. Get yourself a dictionary and find helpful websites. Get yourself other materials to help study and prepare.