With regard to other parents I just said 'oh I'm not discussing scores with anyone because it's personal to ds'. I'm not really bothered what other people think. I knew I would feel horrible if I told people - it's just not anyone's business. People know if your child has passed or not and that's as much as they need to know - although we are just out of catchment for AGSB so the score is quite critical and people do get nosey about that but I just stood by my guns. People told me their child's scores but I just didn't return the information
With regard to your child, I suppose it all depends on your parenting style. I just told ds upfront that I wasn't going to tell him the actual scores until after the hype had died down and he accepted it. He's so busy in and out of school that he just seemed to forget about it and was happy with knowing he'd passed them all and done really well. He asked me if he could read the letters a few months down the line, I think when the allocations came out, and I gave them to him then.
It's not for everyone but it worked OK for me. I've got another child sitting next year and I may take a different approach then, I don't know, I'll see how it works - different child, different personality.