As a general rule, you aren't told, because they have to be vetted in Ottawa or Borden first, especially now...I never told anyone their category other than maybe vision or colour vision, and sometimes hearing, as they might have to be prepared to have further examinations done and or have to pick another trade or classification. If your vision was a 2 or worse and you're applying for aircrew, I'd say so...if you're V4, I'd tell you and your recruiter that right away to ensure you all could get on the same wavelength about picking something from the non-combat arms trades and the medical would come back saying "fit V4 trades/classifications only". Most people's eyes glaze over when you attempt to describe the category system to them anyway - they just want to know that they are fit, not fit, or not so sure, and what do they need to do (if that's possible) to fix it.
MM