You'll want to know if the WISC-IV or WISC-V is being administered, and after testing is completed you'll want to receive a report of the subtests and test results. If the school is administering the WISC, you many not be able to select specific test administrator qualifications (such as familiarity with gifted).

Other recent posts about IQ testing include this discussion,
and a post comparing Yermish article on test prep, and Webb article on testing here.