Thin on graded evidence, decent on what little there is. One mainstream state primary in the village itself. Key-stage-two results in the area sitting at an average maths score of around one hundred and seven. No graded secondary in the village. The honest answer is that this is a place where parents do the per-school dig themselves, because the headline data is too sparse to do it for them.
At primary level, the area around Rowland's Castle has one mainstream state primary, which is Rowlands Castle St John's Church of England Controlled Primary School. The key-stage-two maths average across the relevant district comes in at about one hundred and seven, which is above the national expected standard of one hundred. That is the headline number to work from, and it is a district-wide figure rather than a school-specific one, so it tells you the catchment area is performing above the national mark at age eleven without telling you exactly which school is doing which part of the lifting. For a village this size, with one local primary serving local families, that is broadly what you would expect to see.
On secondary, the brief carries no graded inspection results for any secondary serving this village. The wider Havant catchment to the south has named secondaries including Havant Academy, Park Community School and Warblington School, plus the non-mainstream Prospect School and Releasing Potential School. None of these come with grades or attainment scores in the brief, which means anyone trying to make a secondary-school decision from this answer alone is not going to be able to. The work you need to do is the per-school work: current published inspection reports, open evenings, the conversations with parents whose kids are actually there.
The named-school list above is also the catchment caveat. Having a school in the brief does not mean a house in Rowland's Castle gets a place at it. Hampshire's secondary admissions run on a combination of catchment and distance, and the catchment boundary for any given secondary is not something to be inferred from a list of nearby names. The same goes for the primary: faith schools have their own admissions criteria layered on top of distance, and a controlled primary in a village of fifteen hundred households can fill on siblings and parishioners alone in a year of high demand. If schools are the reason you are buying here, the catchment check is the homework before the offer, not after.
For Rowland's Castle parents who want options beyond the village primary, there are several primaries in the wider area including Bidbury Infant School, Bidbury Junior School, Bosmere Junior School, Fairfield Infant School, Front Lawn Primary Academy, Riders Infant School, Riders Junior School, Sharps Copse Primary and Nursery School, St Alban's Church of England Aided Primary School, St Thomas More's Catholic Primary School, Trosnant Infant School, Trosnant Junior School and Warren Park Primary School, plus Barncroft Primary School. Most of these sit in the Leigh Park and Havant cluster south of the village, which is a different sort of catchment with a different sort of intake, and the journey is not the casual walk that the village primary is.
Verdict: average, three out of five, and the rating is doing the honest thing of refusing to pretend a thin-data picture is a strong one. There is a village primary working in an above-national-average area for key-stage-two maths, and a secondary picture that needs you to do the legwork rather than trust the headline. For families who are buying for the village rather than for the school, that is fine. For families buying primarily on the school, this is a place where the decision is made one inspection report and one open evening at a time.