I don't have any input on DYS, but if you're thinking about achievement testing, I'll note that it is very difficult to score 145+ on the WIAT-III Total Reading Composite, due to the item set format, which tends to cap performance on the reading comprehension subtest. You might have better spread on the KTEA-3, as the reading comprehension subtest has a modified item set format, with decision rules that allow for the possibility of continuing as far as grade 12 items.

...pronounced like the long vowel and first letter of the alphabet...