I find a good strategy to deal with all this stuff is just to ignore it and get at least a credit in actuarial subjects, so that the question becomes irrelevant. Much less work all round.
u dont need a cr mark for business finance. that too is a combo of 2 subjects, and u need a cr average between them. its business finance and acct 2b (aka corporate financial reporting). it forms the finance paper under part 1 exams