A Nottingham school that was told it required improvement in December 2018 has now been reinspected.
The Iona school in Sneinton Dale was told 'the most able children underachieve' in its last inspection that found weaknesses in teaching.
However, six months later, Ofsted returned and found the school now met all the independent school standards.
The independent primary school follows the Steiner Waldorf curriculum where there is no head teacher and pupils participate in main lessons that includes farming and house building, handwork lessons of knitting and clothes making, as well as more traditional subjects.
The fee-paying school charges £6,373.52 per year and there were 73 students enrolled at the time of inspection.
In its last rating by the School Inspection Service (SIS) in 2016, Iona had been outstanding in all areas.
The inspector, Peter Stonier, said: "The previous standard inspection in December 2018 found weaknesses in the teaching of mathematics, writing and science. There were too few opportunities for pupils to develop their writing skills or solve complex problems in mathematics.
"Teachers did not develop pupils’ knowledge of scientific methods well enough, or consistently support pupils’ ability to spell accurately. Pupils did not make good progress over time.
"Teachers are now providing pupils with increased opportunities to write, solve mathematical problems and investigate scientific concepts. For example, the oldest pupils have recently written short stories, poems, and persuasive letters and experienced a writing workshop with a local author.
"A new, whole-school assessment system has been introduced, including in the early years. The system enables teachers to identify the attainment and progress made by each pupil, including the most able pupils, in a wide range of subjects.
"The system is helping to ensure that teachers have adequate assessment information to plan activities which sufficiently challenge all pupils."
In order to improve further, the education watchdog suggested the school should: improve teaching and give more information to parents.
The school had not responded by the time of publication.
