Learning to handle not only your own feelings, but those of others, in such scenarios is a very useful life skill and will be faced again at GCSE, A level and beyond. The kind of unwritten rule here is that if you are successful, you do not initiate a conversation about results. If you aren't, then you can ask how others did and be prepared to put a big brave face on and say 'well done'. Mum or Dad then needs to be on hand to deal with the fall out and acknowledge the inevitable disappointment that will bring with it.
If someone asks you first then you can reveal your result - 'I was lucky enough to pass, what about you?'. For GCSEs etc my children, who have all done very well, stuck to not asking, but responding 'I did OK, thanks. What about you?' and only revealing actual grades if pushed further. At ten this is super-hard, but in some ways when you go into this, you have to be prepared for this scenario. Think of it as a testing lesson in interpersonal skills.
Good luck.
