cash flow ratios for L2

hi I am in a process to memorize key formulas and processes. Are you guys memorizing cash flow ratios listed below? I haven’t come across them doing the CFAI EOCs, BBs and Schweser Practice Exam Book 1.

cash flow to revenue, cash return on assets, debt coverage ratio using CFO, interest coverage ratio using CFO, debt payment ratio, etc

Almost all the formuals you are mentioning there are CFO compared to a item on the Balance sheet or income statement. So there is not much to memorize is it?

if you see a question asking you what is the CFO to revenue, it’s a free question as long as you can find CFO and revenue, it’s those ratios who aren’t as conveniently named that you might have to worry about (remember turnovers or days sales oustanding?)