Groombridge in not in Kent that is East Sussex but has a top primary but you wont be in catchment for Kent Grammars. I hope kentsussexboarder can give more info on this. Langton Green had a decent primary but you really need to make sure you are in the catchment for the school otherwise the alternatives arent that great.
Yalding is known for flooding and it can be quite bad. It seems like almost every year they suffer flooding. There is a river that goes past the middle of the village that gives them the heartache. There is a decent primary but it is very small and if you dont mind mixed classes then you will be fine. Personally even without flooding its not my cup of tea. Feels very grown up and a tad remote and a bit plain for me (maybe when I retire I may want to move here).
Now Maidstone, I will try and be objective but I would only move here if your pockets arent too deep for Tunbridge Wells. You will be spoiled for grammars but they are really so so grammars IMHO. More like Z list grammars if that makes sense. Please this is my personal opinion others may disagree.
The alternatives arent so great because we have 4 grammars in about a mile radius. Even the local indie is rubbish and not one I would spend my hard earned money on. Allington has a decent primary school and its a decent area but again not one I would really move to. Not sure why but I dont just feel it. Looks a bit run down but there is a Waitrose in the area so its perhaps not that bad if we go by the Waitrose profile.
Last but not least is Bearsted the better part of Maidstone but nothing too special. It has a nice village green with some nice restaurants and a train station nearby but parking is a nightmare. Decentish big primary Roseacre and infant Thurnham or if you are a practising Anglican you have St Johns Grove Green. As you can see I am a grumpish Maidstone resident and I feel like the town is going downhill with loads of shops being boarded up and more £1 shops hitting town. If nightlife is your thing then the only town to be in Kent is Maidstone.
Cranbrook is just for boys and they admit only at 13+, alternative is a bad comp. I noticed you mentioned daughter in your post. If you are going to commute I would rule Cranbrook and Sissinghurst out. Nearest station is about 10miles away. Dont know much about primaries there.
What is your budget and are you looking to buy or rent? It will be easier to narrow down the areas.