Laura,
Are you going to be taking the GCSEs in the UK? If you're in the UK, then the tollfree no. to call probably won't be free for you. But you can email LSC with any questions you have about their programs and payment possibilities at
Info@LearningStrategies.com
Youngprer and Mastermind are both teenagers, using PR successfully for their school work. You can do a search for their postings. They are both very helpful and generous with sharing their experiences with PR. 
