I have to ask, what public school would accept adults taking classes along the rest of 15 year olds?
>> In any case people should be allowed to make choices by themselves not be forced by the government.
I'm sorry, but kids/teenagers are generally not allowed to make these choices, for good reasons. If you're an adult, then sure, do whatever. But kids should be in school, whether they like it or not - it's really not their choice to make. We can argue that maybe 15-16 year olds are at the cusp of being able to do this - but I'd say the cut off should stay at 18. You're under 18, you go to school. There's no other option. The question is how does the state manage this.
>>The problem is that most schools are simply opposed to the idea of splitting students based on their ability and willingness to study.
And I agree that it's an awful thing(that the schools are unwilling to do this)