The Advanced Higher is an optional qualification which forms part of the Scottish secondary education system. It is normally taken by students aged around 16-18 after they have completed Highers, which in turn are the main university entrance qualification. Advanced Higher is the highest certificate offered by the Scottish Qualification Authority, as part of the Scottish Credit and Qualifications Framework. An advanced higher is essentially a simulation of the first year of university in that particular subject - this is the reason that Advanced Highers can be used for second year University entry.