Slaughter and May is extending its career advice and tutorial programme with a North London school as part of the PRIME social mobility initiative.

The magic circle firm will fund its programme of weekly one-to-one tutorials, workshops and career events at Islington's Central Foundation Boys' School for a further three years when the current two-year arrangement comes to an end in the summer.

It is estimated that a 90-strong mix of partners, associates and business services staff have provided tutoring on the programme, known as the Key Project, since its March 2012 launch. Over the past 12 months volunteers have contributed over 900 hours.

Students, who can gain places to the programme from Year 9 onwards, attend weekly tutorials from Slaughters lawyers throughout their GCSEs and A-levels.

For the next three-year period the firm will be looking at improving the quality of work placements on offer through the scheme by increasing the amount of structured training, support for tutors in relation to sharing best practice and the amount of resources available to them. It also hopes to increase the number of places available.

Slaughters corporate and banking partner Mark Bennett said: "We hope to get more students on the programme. We have around 90 on it at the moment, and students need to pre-qualify for a place. While there would be capacity issues we are conscious of unmet demand."

Slaughters is one of the 23 founding members of PRIME, a cross-firm initiative aimed at improving access to the legal profession for students from underprivileged backgrounds.

Last July the firm joined forces with ITV, becoming the latest corporate legal team to back PRIME. Through the partnership, five students from the school took part in the scheme in its first year.

The placement involves a week working on a mock advisory task for ITV, followed by two days' work experience with the broadcaster's in-house legal team in order to gain an understanding of the relationship between a law firm and a client.

Since Slaughters' partnership with the school began, 14 students have met their offers from Russell Group universities, compared to none in the previous three years.

Last year 100% of the school's A-level students achieved a pass rate for the first time in its history, with 23% achieving A or A* grades, resulting in 30% of the 2013 A-level group meeting their offer for a place at a Russell Group university.