I agree with vttraveler. I would suggest also using Reader's Theater to help him with practicing reading aloud in front of others. He may just feel real nervous and uncomfortable reading in front of others, therefore his comprehension suffers. Through Reader's Theater, it provides the opportunity for improving public speaking, oral reading skills, listening skills, fluency skills, and group interaction. After reading the script, I would have the students discuss the story in groups. This should help him in comprehending the story.

Have him read aloud to a younger student, have him choral read, have him read from a reader's theatre script, have him read the dialogue of one character...
Building fluency is usually done with books that are below a student's reading level.

My first suggestion is only having this student read independently. Another suggestion is having the student practice reading aloud to his/her parents.

Don't have him read sold. Not a necessary skill. Rad out loud to a group and that is a performance. Anything he has to read out loud should just be quickly retread silently.

Looking for ideas on how to help a 6th grade student who does well in reading comprehension when reading independently but has trouble when reading out loud.