Inequality in education with voucher scheme for bright pupils

The government is kick starting a scheme where the top 10 percent of pupils get some extra lessons. Why is it that the brightest pupils get such treatment. Do you not want to send a message that everyone has an equal chance? I feel that a kid that has a willingness to learn is more important than being bright. So take for example a kid that has just missed the mark and is in the 11 percent. How do you deny this person if there is genuine enthusiasm? Why does the government waste money on silly schemes like this. Squandering public money. They should be focusing on how learning is fun for everyone.