This specification can be found at:

http://store.aqa.org.uk/sciencelab/AQA-SCIA-W-SP.PDF

At the moment all students are expected to take this examiation in year 10.  It is likely that this will change soon and all science examinations will be taken in year 11.

Currently all students will take the Additional science examination in year 11.  The specification can be found at:

http://store.aqa.org.uk/sciencelab/AQA-ADDSCI-W-SP.PDF