Just to add to what the others have said. My sons primary did not encourage nor engage with discussion about grammar schools. I asked if they had the ability and was told, for both of them "Well you could give it a go." Both my boys passed for Pates and so I did more than "give it a go"
You will get used to the idea that this is one avenue where you are likely to recieve very little support both from school or other mums in the playground. I would advise to get a tutor now and start working if you have not already. Some bright kids have been known to fail (for whatever reason) and it would therefore be folly to leave it to year 6 and not give your DC the best chance to consolidate learning.
It is also very rewarding and possible to tutor your DC yourself, if they are of a nature to tolerate it
Don't take all the 'anti-grammar' chat to heart. Everyone is entitled to their beliefs about the system but it is you who has to make the decision for your child, not the school. Keep smiling and good luck!