The Department publishes the attainment and progress scores for students in each institution type. The latest table for A level attainment (provisional figures for 2017/18) and value added scores (revised figures for 2016/17) can be found in the attached table.
On January 24 2019 the revised figures for 2017/18 will be released and will include the first release of value added figures for 2017/18. 1
 https://www.gov.uk/government/collections/statistics-attainment-at-19-years. Select the revised publication for each year (provisional is the latest release for 2017/18) and open the national tables. Table 1a provides figures on A level attainment, table 1e provides figures for value added scores. Future publications will be available from this link.