dear your question is very general. all expemptions are dependent on policies of each institution. but in general you have some exemptions for ICAEW, MBA, BBA and some other
please go through this article on readyratios.com . it is worth reading and also give details regarding calculations.
formula is as follows
Cash Flow Coverage Ratio = Operating Cash Flows / Total Debt
The cash flow coverage ratio is an indicator of the ability of a company to pay interest and principal amounts when they become due. This ratio tells the number of times the financial obligations of a company are covered by its earnings. A ratio equal to one or more than one means that the company is in good financial health and it can meet its financial obligations through the cash generated by operating activities. A ratio of less than one is an indicator of bankruptcy
Annualized rate is a rate of return for a given period that is less than 1 year, but it is computed as if the rate were for a full year.please check out below link for understanding whole process of calculation.
Cash Flow statement and ratios
What is difference between Current Ratio, Quick Ration and Acid Test Ratio? Are they same?
Dividend, Measurement of divident