Additional Maths is a further study of mathematics beyond GCSEs and is considered a Free Standing Maths Qualification. Add Maths also requires an ability to apply knowledge to a situation so we recommend practising with questions.
On SciGo, our 'Add Maths' pages will assume you have a confident understanding of the relevant GCSE mathematics.
(Below are some good external sources of revision for iGCSE/GCSE mathematics)

MyMaths

CGP

Click on any of the buttons below to begin SciGo Add Maths Revision:

Polynomials

Permutations and Combinations

Binomials