A score of 350 would have been comfortably in last year. I know how you feel though, my DS has a score of 354 and I have to remind myself to feel confident about that score but I have moments of doubt. There would have been large numbers of boys who got in who had scores in the 340's last year I think successful scores from 390's to 337 would not have followed a normal distribution.
I have just started the DIY route with DD and its a welcome distraction from thinking about whether or not my son has got in. I'm trying not to think about my DS's score anymore. It's a bit strange starting at the beginning again with simple spellings, grammar and telling the time but its a relief after all that VR which my son was much better at than me.