Hey,
Greetings. Bcom hons is a 3 year undergraduate course including topics like accountancy, finance, mathematics, business studies at intermediate level. In further semesters, you'll learn more about such subjects and will be specialised in specific subjects. Actuarial science includes learning about risk in financial management. It takes around four to six years to complete the course. The difficulty increases at each level. CA becomes tough at later stages too. The syllabus is vast and needs a lot of regular study. Anyway, both the courses require enough and more work from your side to specialise and qualify them. Choose as per your interest.