OFSTED inspectors found "cause for optimism" after a standards sweep of East Riding schools to find out why so many were underperforming.
But the watchdog also found more still needed to be done to secure sustained improvement across schools.
Senior Ofsted inspectors will now hold regular meetings with East Riding Council to monitor improvement strategies as well as the outcome of future inspections.
Ofsted's regional director Nick Hudson told the Mail there were still too many schools requiring improvement following grade three inspections.
He said: "I think what the results of the focused inspections indicate is that there are still too many schools getting grade three, requiring improvement.
"Ofsted's aspirations are that all schools should be at least good."
Mr Hudson said he could not comment on whether the council's school improvement service would be inspected.
Following last month's inspections at 15 schools, improvement was found at just over a third of those targeted.
In a letter to the council's director of children's services Alison Michalska, Mr Hudson said: "The improvement of just over one third of the schools inspected and the sustaining of outstanding practice in one other school gives cause for optimism and reflects the hard work of the senior leaders, teachers and pupils since their last inspection.
"To balance this, it is a concern that two previously good schools have declined and require improvement and six of the previously satisfactory schools have not improved."
No schools were placed in categories of concern.
Mr Hudson acknowledged the work the council was doing to support and challenge the least effective schools, but he said: "Nevertheless, much more needs to be done to establish and embed a clear strategic vision for sustained improvement across schools in the East Riding."
Mrs Michalska said: "The council welcomes the feedback from Ofsted and I am confident the work is well under way to sharpen our strategy will support all schools getting to good or better."
Last month's inspection blitz was ordered after 35 per cent of schools were judged to be less than "good" compared with a national average of 23 per cent.
Strengths found by Ofsted included:
• Well established procedures to support schools judged by the council to cause concern.
• Examples of effective support for schools leading to improvement.
• Local authority financial services and support viewed highly by many schools.
• Partnerships in some areas between clusters of schools hold promise for the future in driving improvement.
Areas for improvement included:
• The level of challenge for schools is variable, partly due to the reducing capacity of the council's resources. While schools identified by the authority as causing concern receive effective support and challenge, many receive little attention.
• Not all heads and governors have a clear understanding of the council's strategy for improvement. A perception is the council lacks challenge and aspiration for schools previously judged good or outstanding.
• Several school leaders think the council does not take a consistent lead in sharing the best practice and promoting school to school support.
• Training provision by the council was viewed by some schools as being of variable quality.
Councillor Julie Abraham, East Riding Council's portfolio holder for children, young people and education, said: "I am pleased with the helpful feedback from Ofsted. "Alongside the recommendations that will emerge from the ongoing scrutiny review of schools' performance, it will help us to deliver the excellent teaching and learning opportunities every East Riding child deserves."More news on hulldailymail.co.ukBookmark hulldailymail.co.uk/news for the best breaking news and exclusive local content.
