Here is Boston University’s dual enrollment info: High School/Dual Enrollment
The course must be open to enrollment by, and graded in direct competition with, regularly matriculated undergraduates at that institution.
In order to seek credit for college-level work completed prior to matriculation (pre-college credit) into an undergraduate program, students must:
Request that the external college or university send an official college or university transcript and course syllabus to the University Registrar for transfer credit evaluation.
The high school sponsoring the dual enrollment must certify that the course(s) under consideration for transfer credit did not fulfill high school degree requirements.
This is from NYU
College Courses Taken While in High School
Credit may be awarded if:
Received a grade of “B” or better
NYU offers corresponding courses
In most cases, courses were taken at a college/university, with college/university students, and taught by college/university faculty.
Courses were not used to satisfy high school graduation requirements
For these schools and some other schoosl a high school offering a dual enrollment class to just high school students will not give college credit because they only give credit to courses offered to all college students and taken primarily by college students. They also don’t give credit for classes that are needed to satisfy high school graduation requirements. Basically you do need to look at colleges individually.
My daughter did have all of her dual enrollment (61 credits I think) accepted by her private school but some are free electives that honestly don’t have any use. Many websites will give you an idea on what classes will transfer but it isn’t until after matriculation that they tell you for sure. A tip is to save all syllabi since they can ask for them especially if it is a class from a college that has never been evaluated before.