Test yourself using the Listen and Spell test.
If you can hear the sound /ar/ in a word, the spelling is nearly always ar. As you go through this list of ar words, say each word aloud and listen to the vowel sound.
"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