Ok so first off, 75% is, by all definitions, "most". So your school's grammar school entry is probably about identical (and this is largely down to socio-economic factors, not the school itself, which is why some people are anti-grammar school although I'm not per se).
Secondly, would you really want that sort of deluge of information? I just drop my kid at the door and ask him what he did at the end of the day, like my mum did with me, and her mum with her. I'd be really stressed if we got more than a weekly update on what the class has done, I have almost never read the nursery updates over the last four years as I was too busy with work and life, and since he started reception, I've never had photos/updates of what my child is doing individually except the parent/teacher consultation which was 8 minutes of "he's fine".
It sounds like you're looking for reasons to find fault because you're not confident that you've given your child the very best. If you're not happy with the school to the point of wanting to change, you need to look into the admission policy for the target school as some don't accept in-year transfers except if you're moving in from outside the county (especially in our grammar area as a lot of parents actually move their children to primaries into the catchment for the two non-selective good/outstanding secondary schools on the county boundary when they suddenly realise their child probably isn't going to get into a grammar).
You also need to check if your target school has spaces, which is unlikely if everyone thinks it's the all-singing-all-dancing option. You can usually check vacancies for the county on your local council website.
Really though, it sounds like your child will be fine if they stay here, why not use the lack of information as a talking point to start conversations? "What was your favourite activity?" "What did you have at lunch?" "Who did you play with?" and let them tell you what they think is important about what happened in their life rather than what a teacher managing a full class decides is worth you knowing about.