No matter how hard I study , I keep failing

Im in college as an 24 year old , studying maths. I study every day at home for one hour and come into college once an week for 2 hours 30 minuets because my course is part time. They only do part time for the maths course otherwise I would do full time. I dont seem to be progressing much. I started college last month. I have to get An C in maths so I can study at my dream college and study my dream course. I left school without an maths grade. I feel stupid. I try so hard but my brain doesnt seem to grasp it.