Mali and Thomas, both 14, are among the first to start the revamped GCSEs, including taking a merged English language and literature qualification.
Mali said she was pleased there was some more coursework for pupils who may "struggle with exams and struggle with the pressure".
"They're actually giving people the opportunity to have time to do it," she said, "rather than two hours, get it done in an exam you've got to revise for, because that's just not some people's forte".
"I don't mind" exams, said Thomas, but "sometimes I feel like the coursework is a bit better because it's such low pressure - it keeps the stress off a lot".
As a parent with children in both Year 11 and Year 10, Sian John's family bridges the old and new systems.
She works in Maesteg School and said the teachers were doing all they could to support the pupils.
Ms John had some reservations about the greater emphasis on coursework in some subjects, but she acknowledged it could be helpful for students who struggled with exam pressure.
"On the other hand my children are very sporty," she said.
"We do a lot of extracurricular activities outside of school so I do worry how the balance is going to affect them with all the deadlines that they're going to have to meet."
"It's fear of the unknown, isn't it? We just don't know until we've gone through that first full year," she added.
Education Secretary Lynne Neagle said the government had taken steps to ensure schools were well prepared.
She said extra funding to Adnodd, which oversees resources, and the WJEC would continue for the next wave of new GCSEs being introduced in September 2026.