thats strange, normally dreamspark is for everyone who is at school. just say that you are in a school that isn´t in the program and that you want to register you with the manual registration and what they need to register you. then they will ask for some things and you got your dreamspark account.
You just have to be in any school. anything that is educating and not a job. (see here at "are only students from major...") I´m doing my A-levels at the moment and will be at an university next year. I just had to contact the dreamspark support and they said me what to do to get into the dreamspark program.