I would talk to your school district's gt department and find out whether they accept outside testing. If they will, find out what test(s) they will consider -- though WISC is probably a safe bet if they do. Our school district uses CoGat and NNAT but it's my understanding that they will consider outside testing. Some school districts only use their own testing. If you are in one of those districts, you may want to save your money unless you have other reasons for testing.