Need advice about Irish secondary education for a talented child

[Biped231]

We live in the UK and my ds is in year 6. He passed his grammar school exam, we are expecting an offer from a very good school. He was also identified as a talented student in science, he is very bright academically.

Very sadly we lost my husband, my son's father six months ago and he is buried in Dublin now. In order to be close to him and to have family and more friends to support the two of us, we started to think about moving back to Dublin. However we know there are no grammar schools there and we will have to go with the local secondary school as far as I understand. There is a centre for talented children but that is all I could find online and they seemed to look for the top 5%, I suspect my son would make it there.

Is there anybody who knows if there is any support for kids who are advanced in some areas in secondary schools in Ireland?
Do you think we would better stay put where we are and go with the grammar school he has won access to?

Thank you and happy New Year to everyone!

Thank you so much for your nice comments and explanations.
Yes, ds will have finished the primary school here when we move but he will still be 11. Then again, he will turn 12 in October. We talked about it and he seems to be okay to go to primary school for another year albeit halfheartedly. The grammar school we are expecting an offer from in the UK is a single sex school as well. There is lots of good single sex schools here too. Even though it is annoying for us, it is not a huge issue.

@Whitegull , I checked my late husband's school, it is in D7, one of the best schools in that area actually but not very successful compared to some others. St Declan's, in case anybody knows. We are late to apply for next year's secondary admissions. But I think it gives us more chance to apply separately for each school. You are right about applications are made to the councils here in the UK rather than schools.

About learning Irish, I think it can be great if he could learn it at least a bit in one year. I am not worried about the differences in the curriculum, he will pick up quickly. I checked maths and English curriculum, he has already finished them all while getting ready for 11+ exam. He can study a little during summer holidays if he needs to.

Thank you very much to each one of you for your help.@

Sounds like 6th class is the way to go. If he is only turning 12 in october, he would still be in the younger cohort in 6th class. My dd turned 12 in September of 6th class and she was in the youngest third of the class. Definitely too young for secondary, particularly when they get to going out age and all his friends are at least a year older. Most of the kids would be between 8/9 months and 20 months older than him.

CTYI is great, my DD did some of the online courses when she was younger and loved them. They do run summer courses and weekend courses for older children too.