Which course should I pursue for a better future? I have completed my graduation this year and am good at finance and accounting subjects.

You can go for CA as you are graduated now so you don't have clear the Entrance exam and directly go the inter that is IPCC Exam Or, MBA is also the best option provided you do it from a good college by giving entrance exams like CAT, CMAT, MAT, etc.

You can go for professional courses like CA ICWA CS CMA. They give you a great career. But they are challenging courses. You need to be more hard-woking and have lot of patience. Or, do an MBA in a reputed college and get placed. Or, go for M.Com