I've made my own formulae for remembering. Eg: I remember SA 540 Audit of Accounting Estimates as we 'estimate' to study for '5' hours, but study for '4' hours i.e. SA 540.
i am sure there must be somelogic behind, which even i dont know. perhaps we might have to do research logically before we can conclude. As said, They is no such thing without LOGIC !!