A grammar school judged to be Inadequate is improving now staff know “mediocre teaching will no longer be tolerated”.

The second special measures Ofsted inspection since Chatham Grammar School for Boys, in Maidstone Road, was heavily criticised in June 2013 has shown the school has made progress.

Since the first monitoring inspection in October last year eight teachers have left and five have joined the academy.

In her report inspector Lesley Farmer said: “Teachers are fully aware that mediocre teaching will no longer be tolerated. Those that have been unwilling or unable to improve their teaching have already left or are leaving. Teachers that remain are keen to improve their practice, and feel valued and well supported to do so.”

Now, although not all teaching is consistently good, in general it has “significantly improved”.

Teachers mark work more helpfully than before and routinely plan lessons to make them engaging and targeted to individual students’ needs, to “challenge their thinking and inspire them to delve further”.

The improvements in teaching standards has been attributed mostly to the strong steer provided by the head teacher Stuart Gardner.

Another area where Ofsted had concerns was in pupil behaviour which has also improved with the knowledge students “will face the consequences of their actions” and be sent to detention if they fail behave or do their homework.

Students now have generally positive attitudes to learning, even on occasions when the teaching is “dull”.

Their attainment is also on the up thanks to a new system of challenging personal targets, however Key Stage 3 groups are not doing as well as Key Stage 4.

New after school catch-up and study support sessions are available to students across all subjects in Key Stage 4 and sixth form to tackle underachievement.

Mr Gardner, the school’s principal said: “I am delighted that Ofsted have been positive about the progress we are making here at Chatham Grammar School for Boys and would like to thank students, staff and parents for their ongoing support, understanding and hard work I know that together we can make Chatham Grammar School for Boys a fantastic place of learning.”