The top score that can be obtained on the Reading Comprehension subtest for an eight-year-old is between 141 and 145 (depending on the exact age). That assumes, of course, that every answer is not only correct, but detailed enough for full credit. Did he also have Oral Reading Fluency (which is the other subtest that feeds into the Reading Comprehension and Fluency Composite)? That is unlikely to be as high as pure reading comprehension, which could also have pulled down the composite. (Not sure if you are reporting a RCF composite score, or just the RC subtest.)
Yes, the ceiling on Pseudoword Decoding is below 160, as well.
So, given the finger splint, all of the timed fine-motor tasks are a bit suspect: PSI, block design, math fluency.
