I'm a high school senior and I'm doing a few college courses online for the weighted gpa boost. If I started a course over my junior year summer and finish the course before I submit an application (say September is the end date) will it still factor into my college gpa? Also if I were to start a course now and finish it by the end of the month would that also count towards my gpa because I finished it before I submitted?
Unless the college courses are 100% sanctioned by your current high school as dual enrollment classes, they will be treated as a separate transcript that you can submit on your common application. You can not fold them into your weighted or unweighted GPA unless your school does that on your behalf. Nevertheless, they will be considered as intellectual vitality which will give you a bump on your admissions if you do well in them like getting As and college credit.
Good luck.
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