Send them your link. When they join free and answer 5 questions, or finish a Skill Builder set, you both get 2 weeks of Pro. Your link works for friends on IB, A Level and CBSE Math Revision as well.
Copy your link, or tap Share on your phone, and send it to a friend in your IGCSE class.
Signing up is free, with no card. Once they've answered 5 questions or finished a Skill Builder set, they get 2 weeks of Pro.
At the same moment, 2 weeks of Pro are added to your account. You'll see "Your friend joined" the next time you visit.
Terms: for friends new to Math Revision (no earlier trial, plan or class account) who join from your link within 30 days of first opening it. Up to 5 free fortnights a term for you (terms run January to April, May to August and September to December); your friends' 2 weeks don't count towards that. Not for school or class-code accounts, and you can't invite yourself. A friend who starts a paid plan straight from your link gets 14 days free at checkout instead. Free months earned under the old offer are kept.