Best Speech and Language Program for Literacy

I am assigned to a 10 year old who just has trouble with his /r/ sound and is currently on the conversational level, but struggles with encoding skills.

His decoding skills are good, but there appears to be a disconnect when writing without prompts. He doesn't appear to have sound patterns down and still reverses b and d letters.

Is there a good test to check out phonological processes and a good program?

His reading specialist mentioned that his articulation significantly impacts his writing skills.

Let me know your thoughts.

Thanks.

SLP 1