The fastest way o get to the States and go to college is to apply for college. Once accepted you can enter as a student. Your mother can petition for you under the family based 2A category. If you don ot adjust under this category before you becone 21 the petition will convert to a 2B cateory. Your brother can apply under the family based fourth preference. But thatvwill take many years.
The answer provided here is general in nature and does not take into account other factors that may need to be reviewed for a more precise answer. You should consult with an immigration attorney before taking any action. The answer here is not intended to create an attorney-client relationship.