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Elliott Park Independent School has been rated 'good' in all areas.
It is an improvement on the last inspection two years ago when Ofsted said the primary school in Marina Drive, Minster, on the Isle of Sheppey needed improvement.
Inspectors Deborah Gordon and Hilary Goddard visited the 61-pupil £5,706-a-year school in November and judged it on quality of education, behaviour and attitudes, personal development, leadership and management and early years' provision.
The report says: "Pupils thrive at this school. They are confident it is a safe place where staff know them well and help them to learn successfully.
"Leaders and teachers have high expectations of pupils. Leaders have made changes for the better. That is why, on the whole, standards have improved particularly in reading, writing and mathematics.
"Pupils work hard. They find their learning interesting and they are keen to do well. Teachers ensure classroom environments are calm and well organised to help pupils learn."
It adds: "Behaviour is good. Pupils enjoy warm and good-humoured relationships with staff and each other. Barely anyone talks about bullying because it is so rare. Leaders tackle any potential problems quickly.
"Parents are very positive about the school. They particularly value the wide range of opportunities offered.
"These are both in school and through sporting tournaments, cultural experiences and links with the community.
"As they move up the school pupils are helped to grow in confidence. They are polite, engaging and articulate.
"This equips them well to move on successfully to the next stage of their education."
Head teacher Colleen Hiller said: “We are absolutely delighted to have been judged ‘good’ in all areas.
"Our teachers work extremely hard to ensure we give our pupils a broad and rich education. We know our pupils well and provide a safe, friendly environment where they can enjoy learning.”
Inspectors said the school's curriculum was not yet "sufficiently coherently planned and sequenced in some subjects" but added: "It is clear from actions leaders have already taken they are in the process of bringing this about."
The school, owned by Tom Allsworth, takes children from three to 11.
Pupils can take the Kent Test which enables successful candidates to apply for grammar school.