Hi Kaibab.
When my DS was 8 years old, his school was contemplating a subject acceleration in Science. They gave him the Woodcock-Johnson Achievement test for just Math and Science subtests. I haven't seen any other reference to a Science subtest on the Woodcock-Johnson, though. Here is what my report says:
"On the Woodcock-Johnson Revised, DS earned the following:
Science, Standard Score (SS)= 174, 99.9%, Gr. Eq.=16.9
They decided to bump him up three grades in Science. Hope that helps, and good luck.