College application

If I’m a high school student and I have had very low grades throughout my high school career and want to go to a four year since I’m the first to go to college in the family. I was wondering what could I do to make up my D grades I have talked to my counseler and she said summer school but that isn’t enough and she said to take online classes but they’re to expensive and I don’t have that kind of money. I know I could do night school but what classes do I take in night school and do colleges accept night school couses?