I don't have my notes with me, but I'll see what I can do off the top of my head.
Using the Roger demo as our base, we have our 4 columns from left to right:
1) Actual OH
2) Flex Budget Equation @ Actual
3) Flex Budget Equation @ Standard
4) Applied OH
So we know that Actual OH will always be given and is equal to Actual FOH + Actual VOH. From there, moving from left to right, our equations are as follows:
FBE@Actual = Budgeted FOH + VOH Rate*(Actual/unit * Actual Units Produced)
FBE@Std = Budgeted FOH + VOH Rate*(Std Allowed/unit * Actual Units Produced)
Applied OH = FOH Rate*(Actual FOH Cost Driver)
+ VOH Rate*(Std Allowed/unit * Actual Units Produced)
Remember that we determine our FOH and VOH Rates by dividing Budgeted OH Costs by the Estimated Cost Driver (note that the Rates may be given in some problems). Also, note above that FBE@Actual and FBE@Standard will have the same FOH, and FBE@Standard and Applied OH will have the same VOH. This may save you some time if you have to calculate the Efficiency or Volume Variance. Another thing to keep in mind is that our FOH and VOH portions of our equations need to be in Dollars, therefore, for example, if our Rates are in $ per Hour, we know that we need to end up with Hours inside the parentheses ($ per Hour * Hours = $). In the example equations above, our VOH Rates would have to be in $ per Hour as Units are canceled out inside the parentheses. Rates may be in $ per Hour or $ per Unit, but just remember that we always have to get back to Dollars for FOH and VOH costs, so use the proper canceling to get there.
I hope this helps somewhat. I struggled with OH Variances as well using Becker, but the Roger demo made things much clearer for me. My suggestion would be to start each MCQ by writing the formulas out, then apply the number to the formula. Since Becker's MCQ will work off the same information for a few consecutive problems, you might as well create the full, 4-column OH Variance table as well.
FAR - 81
AUD - 91
REG - 85
BEC - 80