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You can make up your own gimmick to help you remember how to spell words that are troublesome for you. Here are a few ideas:
Question: What would you yell in a cemetery? Answer: Eee! (Remember that cemetery has three e’s.)
The accident occurred on the RR tracks. (Remember that occurred has two r’s.)
Loose as a goose. (Use rhymes to remember that loose has two o’s.)
A Rat In The House Might Eat The Ice Cream (Use acronyms: The first letter of each word spells arithmetic.)
The capitol building has a dome. (Remember that when referring to the building, capitol is spelled with an ol rather than an al.)