I'm no expert in interpreting test results, nor do I know how good the RIAS test is, but assuming it's a good, valid test, I would assume, with those scores, that your base IQ is average, but that you got early exposure to reading/writing, and fell in love with it and spend a lot of time reading and writing. It's perfectly normal for someone of average to above-average intelligence to become incredibly talented and excel in a particular area due to their love and passion for it.

Now, having said that, I would assume their are sub-tests for each section they gave you scores for, and it would be very interesting to see if there is a lot of variation on the sub-tests... perhaps there is some particular thing that's dragging the scores down, preventing these scores from giving you the full picture.

~amy