We have some excellent and very handy revision sites for GCSE English & Maths at the bottom of the Study Tips page.
The Equality Act 2010 means that there are 9 protected characteristics. This means that you cannot be discriminated against for these reasons.
Age
Disability
Sex
Marriage and civil partnerships
Race
Preganancy and maternity
Sexual orientation
Religion or belief
Gender reassignment
Discrimination based on these 9 characteristics is illegal.
When you see it, challenge it!