FWIW, my DD took the WISC-IV at 7.5. Her pencil skills were terrible, writing was a huge chore and she ultimately got a dysgraphia diagnosis from this same tester. She still scored well on her coding. I would make sure that the tester knows that pencil skills are a concern so they can coach your child ahead of time that they don't care how things look, i.e. size variation, etc. and to just keep going.