1.5 HS GPA would only realistically get into an open admission college like a community college. But it seems unlikely that a new HS graduate with a 1.5 HS GPA would make even a 2.0 GPA to avoid being dismissed from college. The more likely scenario is probably going to a non college path first (work or military service) and later returning to school as a non traditional student with much more motivation and maturity than s/he had in high school.