Read words with the r-controlled vowel pattern or, hearing that or makes its own single sound.
Or is another r-controlled vowel, just like ar. When o is followed by r, it does not say a short or long o -- it says "or," like in for, corn, and storm.
Or shows up in a lot of everyday words. Once this sound is automatic, whole sentences full of or words get much easier to read.
Mastery looks like: They read or words with the correct "or" sound automatically and do not confuse it with ar.
Common stumbles: Mixing up the or sound with the ar sound from last week.