Test yourself using the Listen and Spell test.
If the last syllable of a word is stressed and ends with one consonant letter which has just one vowel letter before it, the final consonant letter is doubled before any ending with a vowel letter is added. The consonant letter is not doubled if the syllable is unstressed.
"This is a fantastic opportunity for our students! I'm sure Spellzone will be invaluable in helping them to improve their spellings and therefore improve the quality of their writing in all subject areas!"
Teacher, High School, UK