The schools are the easy part of buying in Sandhurst. Every graded school is good or better. Two are outstanding. None is failing. The hard part is whether your child actually gets a place, which isn't something a school's grade decides.
Ofsted has graded 17 schools in the Bracknell Forest count behind this answer, and all 17 are good or better, so every single one. Two of them are outstanding. None requires improvement and none is inadequate. These figures cover the local-authority count, not only Sandhurst's streets, so treat them as the standard for the wider area, not a promise about the school at the end of your road. Another 17 settings have no published grade yet. That tells you nothing about them, good or bad. It only means the inspector hasn't written anything down.
The school carrying the town's name is Sandhurst School, the secondary, built in Owlsmoor in 1969. Before then, local children of secondary age were sent out to Edgbarrow School in Crowthorne and to grammar schools further away, so Sandhurst spent most of its history exporting its teenagers every morning. It stopped in 1969, and those children finally got a lie-in. St Michael's Church of England Primary School goes back to 1862 in Little Sandhurst, which makes it older than most of the houses whose owners are trying to get into it. Owlsmoor Primary School and College Town Primary School serve the neighbourhoods they're named after, and a spread of infant, junior and primary schools around Crowthorne, Camberley and Yateley fills out the choice for families near the edges of town. Wellington College, the private school in Crowthorne, is also close, for families whose budget runs to it.
None of this guarantees a place. A good grade across the board creates a strange kind of competition: when every school is good, parents fight over whichever one is nearest, most convenient or most talked about at the gate, and the admissions criteria pay no attention to any of that. The council applies its rules, whatever the listing said about "within walking distance". Before you buy for a particular school, check that school's admissions rules for the year you're applying and how far away places ran out last time. Don't take anyone's word for where the catchment ends, especially not the word of someone selling the house.
Schooling is one of Sandhurst's real strengths, and it's hard to be unlucky here unless you pin everything on one school and ignore the admissions rules.