Gildredge House has unveiled further improvements to the school and is holding an open day for prospective sixth formers.
The free school in Compton Place Road, Old Town, is gradually completing building work and taking more pupils each year since opening in September 2013.
The latest phase was unveiled when the pupils returned from half-term.
Named the Waterfield Wing, the area has a glass fronted main entrance and incorporates a state-of-the-art multi-use performance space known as The Atrium.
The lower school has also relocated to the purpose-built accommodation in the southern part of the Waterfield Wing, which includes a large lower school hall and lower school library.
The final phase of the construction project, which includes the sports hall and other spaces such as music technology and graphics, will be handed over by the end of the month.
Gildredge House boasts accommodation and facilities for Sixth Form teaching and will be taking on students from September 2015, said a school spokesperson.
The free school will be holding an open evening for prospective students and their parents on November 25.
Prospective parents and sixth form students will have the opportunity to look at all sections of the school, including the stand-alone Temple Grove Wing which will be used exclusively by the sixth form.
The open evening starts at 6.30pm and the headmistress, Lea Gilbert, will give talks at 6.45pm, 7.15pm, 7.45pm and 8.15pm.
The school has reported a successful Year 7 open day last month, when we welcomed over 1,000 visitors.
The reception open morning on November 15 is now fully booked.
If your child starts school next September and you have not booked a place, call the school on 01323 400650 so staff at Gildredge House can make alternative arrangements for you to visit the school.